1. Referring to Diagram 5, center Unit 1 and a mottled blue B circle on a blue print 21" square. Pin or baste pieces in place. Using clear monofilament thread, machine-zigzag-stitch around outer edges of unit and circle to make a blue Aster block. The block should be 21" square including seam allowances. Repeat with Unit 4 to make a second blue Aster block.
2. Using units 2 and 3, remaining mottled blue B circles, and dark blue print 21" squares, repeat Step 1 to make two dark blue Aster blocks.