Have you looked at the gallery of quilts display to see what type of tumbling block you might like?
http://www.quiltingboard.com/user_page.jsp?upnum=2259

My only advice is that you carefully pay attention to where the dark, medium, and light side goes. It is easy to mix up. Here is one I did for DH. He picked out his colors/fabrics.

Wow, Madquilter, that is amazing! I really admire your use of color and shadeing. I can't seem to get it right. Probably just lack the patience.