I have a WIP that's a reversable quilt-as-you-go quilt that is lighter fabrics on the front and darker fabrics on the back. It's done in 9 1/2 inch blocks that are hooked together with sashing. Half the block is a triangle and the other half is strips. I'm making it to donate to Relay for Life to raffle so I wanted to try something to appeal to a lot of people so I did one side with lighter fabrics and the other side with dark ones. It was super easy and a lot of fun to do. If you want, I will try to find the book where I found the idea.