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It’s time to celebrate the colors of summer! These cheery pinwheel coasters with their “hot dots” will inject some bright pops of color into your tablescape. The design is based on a classic S4H tutorial, but we’ve revised things a bit to utilize pre-cut 10″ x 10″ Layer Cake squares, showing how cute it can be to bundle together variety of colors into a pretty set. Dig down into your scrap stash for some fave prints and solids and get these pinwheels spinning! Great as a gift idea, but you’ll surely want an extra set or two for yourself.

These coasters are fast and easy, but when working with triangles, you do need a little patience and precision. If you are new to quilting, check out our five-part Quilting Basics series for all the tips you need to get started with success.

Although we chose to keep a matching “hot dots” theme across all our coasters, they would be just as adorable with a completely random mixture of prints, perhaps keeping just the solid color consistent in order to create coordinated sets.

Each coaster finishes at approximately 4½” x 4½”.

Sewing Tools You Need

Fabric and Other Supplies

NOTE: Amounts listed are for a set of four mix and match 4½” x 4½” coasters.

  • Scraps or EIGHT Layer Cake Squares (10″ x 10″); if you choose not to fussy cut your pinwheels, you could also use Charm Squares (5″ x 5″), we cut ours from coordinated polka dot layer cake squares, originally from the Oh Deer collection by MoMo for Moda
  • Scraps or ¼ yard of a 44-45″ coordinating solid; we originally used Cotton Couture in Soft White by Michael Miller Fabrics
  • Scraps or ¼ yard of low loft batting
  • All purposed thread in a neutral color for topstitching/quilting; we used natural
  • All purpose thread to match fabrics
  • See-through ruler
  • Iron and ironing board
  • Scissors or rotary cutter and mat
  • Fabric pen or pencil
  • Straight pins
  • Seam gauge
  • Seam ripper
  • Hand sewing needle

Getting Started

  1. From the solid fabric, cut FOUR 5″ x 5″ squares.
  2. Stack and cut the squares along the diagonal to create two sets of triangles.
  3. Stack and cut the triangles in half to yield a total of sixteen solid triangles. Each triangle is 3½” along the sides and 5″ across the base.
  4. Using a solid triangle as a pattern, fussy cut FOUR triangles from EACH of the patterned fabrics selected for the coaster tops.
  5. Center the motif within the triangle pattern.
  6. This fussy cutting is especially important if you have a bold, repetitive pattern such as we had with the large dots. The pinwheel effect will be much stronger if each patterned triangle is as identical as possible. We used red/white, lime/white, orange/white and pink/white polka dots.
  7. If you choose not to fussy cut, you can create your patterned triangles in the same manner as the solid triangles above.
  8. Cut ONE 5″ x 5″ square from each of the fabrics selected for the coaster backs. We used orange/orange, lime/red, and decided on pink/red for both of the remaining two backs.
  9. From the batting, cut FOUR 5″ x 5″ squares.

At Your Sewing Machine & Ironing Board

  1. Pair up a solid triangle with each of the print triangles. You should have sixteen pairs. Pin each pair along the 5″ base.
  2. Stitch together, using a ¼” seam allowance. We used our Janome Quarter Inch Seam foot.
  3. You can also stitch them all at once, using the chain piecing method.

    NOTE: As mentioned above, if you are new to piecing, check out our Quilting Basics Series. All the sections are excellent for those new to quilting; Part 4B covers chain piecing.
  4. Press flat, pressing the seam allowance towards the darker triangle. When complete, you should have sixteen small squares.
  5. Pair up the squares into eight sets of two.
  6. Pin the eight sets of two right sides together along their inside 3½” sides.
  7. Stitch together, using a ¼” seam allowance.
    NOTE: Remember, the seam allowances should be pressed towards the darker (the print) portion of the square. This will allow the center points to match up and the triangles to lay flat against each other when placed right sides together.
  8. When complete, you should have eight rectangles, each made up of two squares. As shown below, your points don’t match up quite yet; that’s correct – don’t worry.
  9. Pair up the rectangles to make a larger square and complete pinwheel pattern.
  10. Pin in place, aligning the long center sides and being careful to match the seams.
  11. Stitch together, using a ¼” seam allowance to create each finished square.
  12. On the back, use your seam ripper to remove just a couple stitches on both sides of the seam at the very center. This will allow you to swirl the seam so you can press everything nice and flat. This is a quilting technique called pinwheeling.
  13. When done, you should have four pinwheel coaster tops.
  14. Cut each top down to a 5″ x 5″ square, using the center seam as your guide to trim an even amount off each side so the pinwheel pattern remains perfectly balanced.
  15. Find the four solid back squares and the four batting squares.
  16. Create four “quilt sandwiches” from the assembled pieces. To do this, place a batting square flat on your work surface. Place a coaster top right side up on top of the batting, aligning all four sides. If you didn’t trim exact squares of batting above, trim away the batting square now so it is flush with the coaster top.
  17. Finally, place a back square right side down on top of the two appropriately coordinated previous layers. Again, make sure all raw edges are flush. You should have four sets of three layers.
  18. Pin in place around all four sides, leaving a 2″ opening along one side for turning.
  19. Using a ¼” seam allowance, stitch around all four sides, remembering to pivot at each corner and to lock your seam on either side of the 2″ opening.
  20. Trim the corners and turn the coaster right right side out. Press well, pressing in the raw edges of the opening so they are flush with the sewn seam.
  21. Hand stitch the opening closed.
  22. Re-thread the machine with a neutral thread in the top and bobbin. We used natural, and we lengthened our stitch.
  23. Run a double row of stitching/quilting around the inside of each solid triangle. The first seam should be just inside the triangle’s seam line.
  24. The second seam should be ¼” from the first. The beauty shots above of our sample set allow you to easily see the topstitching from both the front and back.
  25. For the cleanest finish, use a lock stitch if possible rather than a back tack or leave your thread tails long and hand knot the ends to secure then trim the tails flush.


Project Design: Alicia Thommas
Sample Creation and Instructional Outline: Debbie Guild

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2 years ago

Happy Monday SFH and Liz. I read every post!! I just can not comment bc I am always running. I am taking care of my 97 year old daddy, and also a gramma to 5 littles (oldest is turning 6 in June) of my two wonderful daughters and their hubbies. And then there is my sweet patient, oh so patient hubby 🥰❤️ I am going to make a few of these coasters, or some like them Thank you for the pattern. My niece is going to be wed to her sweetheart in July, I doubt we will risk the travel… Read more »

Liz Johnson
Liz Johnson
2 years ago
Reply to  Rosemary

Hello Rosemary – Thank you for such a sweet note – a great “first read” on a Monday morning. These happy coasters would make a lovely wedding gift!!

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