You might want to consider a 2 slice layer cake pattern. You can watch a video on it from Missouri Star Quilt co. They use a layer cake, but I have done it with a layer cake and then just with fabric that I selected. The last one I made, I didn't even cut my fabric into layer cake sizes first (10 x 10). I just skipped that step and cut the fabric the sizes I needed. I have a picture of one I made with a layer cake though. It looks very similar to the Turning 20 pattern, and you can learn it by just watching the video once.
Let me see if I can find a picture of my quilt, in case it helps. ....Okay, I found two. The first I just used five fabrics, and the second is from a layer cake.
Maybe this pattern is close enough to what you are looking for.
Dina
http://www.youtube.com/watch?v=jxC-0T5lXw4