Just saw a pattern this morning on allpeoplequilt.com It would be perfect, but I think you would need to piece half the block and use a design wall so you didn't put the same color next to each other. It is called Illusion in Neutrals from American Patchwork December 2009. The link is for a free download of an color option, but you can at least get the idea of how to make it.
http://www.allpeoplequilt.com/magazi...ions_ss16.html