Inside each triangle of the pinwheel you can make a design: zigzags, leaves, spirals, of a triangular feather sort of thing. Just have fun with it.
You might want to try drawing it on a pad of children's drawing paper and see where your doodling takes you.
This is probably one of the main reasons i like to go to Barnes & Noble and browse the quilting magazines. More quilting ideas! and of course the discounted coffee, since I use my son's account for the coffee.
ali