There were lots and lots of half-square triangles in that blue-and-yellow quilt. The pattern said to piece them a little oversize and then trim them down so they would be exactly 4 1/2" square. Well, I don't think I could have done it without this baby. It was designed by Marsha McCloskey, and it really works. I picked it up at one of my favorite places, Quilter's Emporium in Houston, but it can be ordered online too.