Our old favorite pinwheel made from 10" squares. Very big, very fast--too much fun.
It uses 2 10" squares from each of 18 fabrics. The Tonga Batik Squares work because Timeless Treasures puts 2 each of 20 fabrics in the bundles. Two Bloom Packs of 10 12"x22" or Fat Sixths, work also. My cover girl here is made from leftovers of some of my favorite fabrics.