Mystery Quilt 2025 - Week 5

Welcome to Week 5 of the Mystery Quilt 2025 journey!
This week, we're diving into the art of half-square triangle (HST) blocks—a fundamental building block for quilters of all skill levels. Whether you're a seasoned pro or just starting out, mastering HSTs will unlock a world of creative quilting possibilities.

Half-square triangles are incredibly versatile and can add depth and movement to your quilt design. The technique may seem challenging at first, but with a few simple steps, you'll be assembling crisp, precise blocks in no time. Let's break down the process to make your quilting experience smooth and enjoyable.

I am sew proud of everyone so far!

This mystery quilt is sure to look stunning, no matter which fabrics you’ve chosen! I’ll be creating my own quilt using our Poppy Seeds collection.

Do not worry if you are not using this collection, you can use your own scraps. I would just love to still inspire you every week! Check out the additional images of Block 5 below in various fabric collections to get your creativity flowing!

For Week 5, you will need:

(These notions are just my recommendations)

• Fabrics
• Creative Grids® Quilt Ruler 6½" x 6½"
• Crisp Fabric Spray   
  (Edyta’s Tip: I like to press all my fabric ahead of cutting. I use Crisp for a nice finish!)
• Aurifil Thread – 2310 recommended  
• Sew Daisy Fabric Markers (Use fabric markers to stay organized)
• Olfa Spinning Mat 
• Olfa Rotary and Blades 
  (Edyta’s Tip: Always have a stash of fresh blades for your rotary and remember to change yours)
• Pins, Scissors, Needle Threader, and Double Needle Threader
• Microtex Needles 70/10   

Once you have everything ready, it is time to begin!

Block 5A and 5B 
6½" x 6½" unfinished
Make 20 Block total of 5A (make 8 of each of your lightest purples, and from your dark purple, make 4) and a total of 4 Blocks 5B from dark purple.

Cutting Directions:

Select one light fabric and three dark fabrics.
Light Fabric: 96 light HSTs cut from 48 – 3⅞” squares (A)
Dark Fabrics for Blocks 5A (2 fabrics - light purples):
32 dark HSTs cut from 16 – 3⅞” squares each fabric (per color) (B)
Dark Fabric for Blocks 5A and 5B (1 fabric - dark purple):
16 dark HSTs cut from 8 – 3⅞” squares (B)
16 dark HSTs cut from 8 – 3⅞” squares (C)
NOTE: You can also use more light and dark fabrics if you want to get a bit scrappier.

Block Assembly

To make one HST unit for Block 5A, join 1 A - 3⅞" light half-square triangle and
1 B - 3⅞" dark half-square triangle as shown. Make 80.
Repeat steps for Block 5B by joining 1 A - 3⅞" light half-square triangle and 1 C - 3⅞" dark half square triangle as shown. Make 16.

Sew HST units into rows.

Sew rows together.

You'll use these half-square triangle blocks to add visual interest and dynamic patterns to your finished quilt top. Don't be afraid to experiment with bold fabric choices or playful layouts—it all adds to the unique character of your project.

Make sure to watch our video tutorial for tips!

Four of our Block 5Bs will be positioned in each corner with five Block 5As on each side of the quilt center on our Mystery Quilt 2025 grid. Please notice the rotation of the blocks.

INSPIRING COLOR OPTIONS

Block 5 - Dahlia Collection

Block 5 - Lighthouse Collection

Block 5 - Sewing Bird Collection
(You can also use the same dark fabrics for these blocks and it will still look SEW beautiful!)

These are just a few of our fabric options- I can't wait to see what you create!
Visit our website for more stunning options.

As promised, I’m excited to share not only the mystery blocks I’ve been working on, but also a few of my all-time favorite block designs—perfect for creating truly eye-catching borders.
Here is an example on our Log Cabin pattern.

Edyta's Tip:
Square up each HST for best results.

Happy Quilting!
Edyta

Please remember to share your progress photos to Instagram and Facebook!
Tag us @laundrybasketquilts and #mysteryquilt2025