DogHouseMom, I like the idea of radiating lines. I'm thinking about starting them at the tip of the pinwheel and go into the open space on the block. I think it will look like wind coming off the pinwheel after you blow on it.
I have been doing drawings of it with curls, lines, swirls, everything I can think of.
JanQuiltz, No, it doesn't have a name yet. It is a gift for the unborn baby of a coworker. I still have several months to finish it.