Turn small leftover fabrics into a colorful Patchwork Mosaic Quilt Block with this creative scrap-friendly sewing technique.
The original tutorial from Sewing & Patchwork DIY starts with a 20 cm square fabric foundation, adds a small center square, and builds outward with narrow fabric strips until the entire block is covered.
One finished block measures approximately 18.5 cm × 18.5 cm. Make four blocks and you can join them into a colorful patchwork panel for a cushion, mini quilt, bag, table project, or other scrap-friendly sewing idea.
Below you'll find an organized guide to the technique, fabric-selection tips, accuracy advice, troubleshooting, project ideas, and the original free video tutorial.
Patchwork Mosaic Block at a Glance
| Project | Patchwork Mosaic Quilt Block |
| Original Tutorial | Sewing & Patchwork DIY |
| Starting Foundation | 20 cm × 20 cm |
| Center Square | 5 cm × 5 cm |
| Strip Width | Approximately 3 cm |
| Suggested Seam Allowance | Approximately 7–8 mm |
| Finished Block | Approximately 18.5 cm × 18.5 cm |
| Four-Block Panel | Approximately 36 cm × 36 cm |
| Scrap Friendly | Yes |
| Skill Level | Beginner-friendly |
| Source Format | Free video tutorial |
| Source Checked | September 2026 |
Why This Mosaic Block Is Perfect for Fabric Scraps
Many quilting scraps are too narrow for traditional blocks but are still large enough to cut into 3 cm strips.
This technique gives those leftovers a purpose by building the design outward from one small center square.
The fabrics do not need to come from the same collection. In fact, combining different prints and colors can make the mosaic effect more interesting.
Materials You Need
- 1 non-stretch fabric foundation: approximately 20 cm × 20 cm
- 1 center square: approximately 5 cm × 5 cm
- Assorted fabric strips: approximately 3 cm wide
- coordinating sewing thread,
- sewing machine,
- quilting ruler,
- rotary cutter or fabric scissors,
- fabric marker,
- iron and pressing surface.
The original tutorial uses a non-stretch cotton foundation. A stable woven fabric makes it much easier to keep the mosaic block square while additional strips are sewn around the center.
Step 1: Prepare the 20 cm Foundation
Cut one square of stable fabric measuring approximately 20 cm × 20 cm.
Press the fabric so it lies completely flat before marking or sewing.
Because this foundation remains beneath the patchwork, avoid bulky or highly stretchy fabrics.
Step 2: Mark the Diagonal Guidelines
Draw one diagonal line from corner to corner.
Repeat from the opposite corners so the two lines cross in the center and form an X.
These guides make it much easier to position the central square accurately and keep the growing mosaic balanced.
Step 3: Position the Center Square
Place the approximately 5 cm × 5 cm center square where the two diagonal guidelines intersect.
The original project uses a contrasting center so it remains visible as the surrounding strips are added.
Strong contrast is useful because this small square becomes the visual anchor of the entire design.
Choose a Strong Center Fabric
Try using a fabric that is noticeably lighter or darker than your first group of strips.
Good options include:
- a bright solid,
- a small floral,
- a dark jewel tone,
- a fussy-cut novelty motif,
- or a contrasting scrap from another project.
Step 4: Add the First Fabric Strip
Cut or select a fabric strip approximately 3 cm wide.
Position it against one side of the center square and sew it in place.
The demonstrated project uses a seam allowance of approximately 7–8 mm, close to the width of a standard presser foot.
Step 5: Press the Strip Open
After sewing, fold the strip away from the center and press it flat.
Pressing after every addition keeps the block smooth and makes the next strip easier to align.
Avoid stretching the foundation while pressing.
Step 6: Add a Strip to the Opposite Side
Choose another fabric and sew a strip to the opposite side of the center.
Press it open before moving on.
Using different colors on opposite sides can help create the strong mosaic effect seen in the original project.
Step 7: Add the Third and Fourth Strips
Add fabric to the remaining two sides.
Once all four sides have been completed, you have created the first complete round around the center square.
Step 8: Begin the Second Round
Continue adding 3 cm strips around the growing patchwork center.
You can repeat the original color order or introduce additional scraps.
Repeating a color sequence creates more visual structure, while changing every fabric produces a more spontaneous scrap-quilt appearance.
Keep Building Outward
Continue the same sew, fold and press sequence.
Each round moves the patchwork farther toward the outside edges of the foundation.
The foundation beneath the strips helps support the growing block and gives you a consistent outer shape to work toward.
Use the Diagonal Guidelines to Check Balance
As the block grows, occasionally check the relationship between the center and the original diagonal markings.
If one side grows faster than another, correct the placement before continuing.
Color Ideas for a Mosaic Quilt Block
Rainbow Mosaic
Begin with red, then move through orange, yellow, green, blue and purple.
Jewel Tones
Combine emerald, teal, sapphire, plum, burgundy and deep pink.
Low-Volume and Bright Scraps
Alternate light neutral strips with stronger colored fabrics.
Two-Color Version
Alternate two contrasting colors for a much more graphic geometric block.
True Scrap-Basket Version
Use whatever strips you already have and concentrate on contrast rather than exact color matching.
Mix Prints Carefully
Floral, polka dot, stripe, batik and geometric scraps can all work in the same block.
If every strip contains a very large or busy print, however, the mosaic structure may become difficult to see.
Mixing solids, small prints and stronger feature fabrics usually creates better visual balance.
Can You Use Different Fabric Types?
The original project demonstrates that different fabric scraps can be incorporated into the design.
For the easiest sewing experience, fabrics with similar weight and stability are preferable.
If you mix cotton with velour or another fabric type, make one test block first and check that the different fabrics feed evenly through your machine.
Step 9: Cover the Entire Foundation
Continue sewing strips until the fabric foundation is completely covered.
Do not worry if the ends of the strips extend beyond the outside edges. They will be trimmed later.
Step 10: Secure the Outside Edge
Sew around the perimeter approximately 2–3 mm from the edge.
This line of stitching helps keep the many strip ends secure while the block is trimmed and joined to other blocks.
Step 11: Trim the Block Square
Use a quilting ruler and rotary cutter to remove the fabric extending beyond the foundation.
The original project trims the block to approximately 18.5 cm × 18.5 cm.
Check all four corners with the ruler before making the final cuts.
Do not automatically trim every block smaller to correct one uneven edge. First verify the intended measurement and square the block from its center whenever possible.
Step 12: Press from the Wrong Side
Give the completed mosaic block a final press.
Pressing primarily from the wrong side can help flatten seam allowances without distorting the visible fabric strips.
Make Four Blocks for a Cushion Front
The original tutorial demonstrates joining four mosaic blocks into one larger panel.
Arrange them as a simple 2 × 2 grid.
You can rotate the blocks before sewing them together to create different secondary patterns.
Experiment with Block Rotation
Rotation can dramatically change the finished appearance.
Try:
- all four blocks facing the same direction,
- rotating each block 90 degrees around the center,
- creating mirrored pairs,
- or positioning matching colors toward the middle.
Photograph several arrangements before deciding which one to sew.
Join the Blocks into Pairs
Sew the top two blocks together and then the bottom two blocks.
Press the seams before joining the two larger sections.
Match the center intersection carefully so all four mosaic blocks meet cleanly.
Finished Four-Block Panel Size
Four 18.5 cm blocks joined together produce a patchwork panel measuring approximately 36 cm × 36 cm.
The original tutorial suggests using this as the decorative front for an approximately 40 cm × 40 cm cushion.
Other Ways to Use Mosaic Blocks
You do not have to make a cushion.
The blocks could also become:
- a colorful scrap quilt,
- a table runner,
- placemats,
- a tote bag panel,
- a sewing-machine cover,
- a mini quilt,
- a wall hanging,
- or a patchwork rug or mat.
Make a Larger Scrap Quilt
Once you have established a color system, you can continue making 18.5 cm mosaic blocks until you have enough for a larger quilt.
Lay all completed blocks out before assembly and rotate them until the repeated lines create a layout you like.
Common Mosaic Block Mistakes to Avoid
Using a Stretchy Foundation
The backing square should remain stable while many fabric strips are added.
Skipping Pressing Between Strips
Small folds and raised seams become harder to correct after additional rounds are sewn.
Changing the Seam Allowance
A consistent seam allowance helps each round remain balanced.
Ignoring the Center Position
Start with an accurately centered 5 cm square so the growing mosaic does not drift excessively toward one edge.
Trimming Before the Foundation Is Covered
Finish all of the strip piecing first, secure the perimeter, and then square the block.
Using Too Many Similar-Value Fabrics
Contrast helps individual strips and the central mosaic structure remain visible.
More Scrap-Friendly Quilting Ideas
If you enjoy building patchwork from strips, explore our Half Log Cabin Quilt Free Pattern .
For another way to turn small leftover pieces into a colorful block, see our Scrappy Heart Quilt Block Tutorial .
You may also enjoy our Beautiful Patchwork Cushion Cover Tutorial for more fabric-scrap home décor inspiration.
Patchwork Mosaic Block FAQ
What size is the starting foundation?
The original tutorial begins with a 20 cm × 20 cm non-stretch fabric square.
What size is the center square?
The center measures approximately 5 cm × 5 cm.
How wide are the fabric strips?
The demonstrated project uses strips approximately 3 cm wide.
What size is the finished mosaic block?
After trimming, each block measures approximately 18.5 cm × 18.5 cm.
Is this project good for fabric scraps?
Yes. Using leftover strips is one of the main advantages of the technique.
Can beginners make this block?
Yes. The construction uses straight seams and repeated strip piecing, making it approachable for beginners who are comfortable using a sewing machine and iron.
Is there a free written pattern?
The original resource is a free video tutorial rather than a separate downloadable PDF pattern.
What can I make with four blocks?
Four blocks create an approximately 36 cm square patchwork panel, which works well as the decorative front of a 40 cm cushion.
Watch the Original Patchwork Mosaic Video Tutorial
Sewing & Patchwork DIY demonstrates the complete scrap-fabric technique, from positioning the center square to adding the strips, trimming the finished blocks and combining them into a larger project.
Watch the Original Patchwork Mosaic Tutorial →
Tutorial Source
The featured mosaic-block technique is demonstrated in “Still Collecting Fabric Scraps? Then This Colorful Patchwork Mosaic Is for You!” by Sewing & Patchwork DIY.
The Quilting Time does not reproduce the original video. This article organizes the project in English and adds fabric-selection ideas, pressing tips, layout suggestions, troubleshooting, project inspiration and related internal resources while directing readers to the original tutorial.
Source availability checked: September 2026.
Happy quilting!
