Somewhere I saw a "magic"formula for cutting scraps. All the pieces fit together, like two 2 1\2" squares would fit with a 4 1\2" square, which would go with a rectangle cut just the correct size, and half square triangles, or hour glass bocks also cut the correct size... I should have copied it all down when I saw it, but alas, I did not. I thought it would be a great system for cutting scraps! Anyone know about that?