Sew together three matching blue print 2x21" strips and two blue stripe 2x21" strips to make a strip set (Strip Set Diagram). Press seams toward blue print strips. Cut strip set into two 8"-wide blocks. Each block should be 8" square including seam allowances. Repeat to make 25 blocks total (eight sets of two matching blocks and nine single blocks; set aside remaining strip sets from single blocks to use in other projects).