I put my D40 on bulb, pointed it at the moon, and shook the camera. I tried to write my name, but it didn't work out so well. This is what happened. It looks pretty cool.
If you hadn't explained this was the moon you "used" to try and write your name with, I'd never have guessed! What a cool idea! I'm with K_Pugh, it somehow looks like toothpaste.