I taught a mystery quilt at my quilt guild and called "I'm Working On A Chain Gang". Everyone had to cut 2 1/2" (dark & med) squares and/or strips and put into a brown bag. They were allowed to pick one background (light) of their choosing. As they took the dk pieces from the bag they were the ones they had to use (no putbacks), and all were combined with their bg pieces. It was a really fun experience for most of the girls, but there were a few who did struggle with the scrappy part of it. As we went along, I took a lot of pictures of what everyone was doing and many of their comments. Two years later I put everything together on a CD and shared the whole thing with everyone at one of our guild meetings. Did we ever enjoy all of what everyone did that day and how their quilts turned out. Oh by the way, the pattern we did was a simple double Irish chain but no one knew that til they finished.