I agree that your choice of pattern will have a lot of waste if you start with charm squares.
If it is pinwheels you like, the Missouri Star Quilt Company has a tute on how to make pinwheels from charm packs.
http://www.youtube.com/missouriquilt.../2/ekYpJzHoW6E
I made a block to try this technique. It was fun and the bias sides did not give me a problem.