My only rag quilt was made from flannel shirts, backed with jeans donated by a beloved family member. I made the blocks 5 1/2" because it was easier to cut them with my 5 1/2" ruler. That was a major mistake. All the extra seams made the quilt heavier and very difficult to clip. It would be more useful and easier to handle if I would have made 10 - 12" blocks and the different flannel fabrics would have shown up better.