You could do a snowball alternated with 9 patch. You'd need to cut the yardage at 9.5" squares to do this (your 3.5" squares would finish a 9 patch at 3x3 = 9" (9.5" unfinished). Use some of the 3.5" squares for the corners of the snowball blocks, or cut yardage for the corners to all be the same.