I actually started with four" squares. My husband cut me a smaller twister tool that measures 2 3/4" square. (He used a plastic picture frame that cost about $2 at Wal-Mart. He scored the lines and filled with permanent black ink. It works just fine except it is thin plastic and I was worried rotary cutter would damage it. We put little sandpaper-like dots on back to keep it from slipping when cutting and also to make sure I cut with the right side up!) It would be easy to make with 5" blocks.