Assemble the Blocks
1. Pair each of the four 3-3/8x42" strips from one bright print with a muslin 3-3/8x42" strip; layer them with right sides together and press to temporarily hold the strips in place. Cut the four pairs of layered strips into 44 layered 3-3/8" squares (see Diagram 1).
2. Referring to Diagram 2, cut a pair of layered 3-3/8" squares in half diagonally to make two pairs of layered triangles. Stitch 1/4" from the diagonal edges of each layered triangle pair. Press each triangle pair open to make two triangle-squares, pressing the seam allowances toward the bright print triangles. Each pieced triangle-square should
3. Sew together four triangle-squares in pairs (see Diagram 3). Press the seam allowances in opposite directions. Join the pairs to make a Pinwheel block. The pieced Pinwheel block should measure 5-1/2" square, including the seam allowances. Repeat to make a total of 22 Pinwheel blocks.
4. Repeat steps 1 through 3 with each of the six remaining sets of bright print 3-3/8x42" strips and the remaining muslin 3-3/8x42" strips to make a total of 154 Pinwheel blocks.