I make pinwheels using two equal pieces of fabric right sides together. Sew a quarter inch around the outside of the squares making sure they are right sides together. When that's done, cut them on both diagonals. You will then have 4 pieces. Press them flat and sew them back together. You will have two halves of the pinwheel block and once you sew the two halve together you will have one complete pinwheel. It's easy, but may sound complicated. The beauty of this method is that there are no tiny triangles to cut out. I did 17 of them at our sewing bee last month. I already had 5" squares cut out and just got right down to sewing.