I'm going to try John Flynn's diagonal method - but i'll probably put another fabric between the 2 pieces. I almost never use just one fabric on the back of the quilt. I usually put something from the front of the quilt on the back. His method would work very nicely for wall hangings, though, where you don't really care a lot about how the back looks. You could jazz up the back with a band of color from the front, and make a BIG DEAL out of the diagonal cut instead of trying to hide it.