A clay's choice would be fun to use the one in the middle and the corner blocks the other. You would need to buy a lighter for the other blocks to coordinate it. It is a man's favorite type quilt. If you google images of it, there is one that is like I am talking about.
All that being said, What kind of interests does your son have? There is a hunter's star that might be fun. Get the idea? An american history buff might like burgoine surrounded.