So I was talking to Right Minded today, and I had seen a video of crayons getting shot. I promised him a post on it. However, I cannot for the life of me find the video of the crayons getting shot (if you read this, and know where one is, send it, please).
What I found when looking was a neat tutorial. I have tried a similar method, using crayon to fill in recesses carved in on a gun. Results look pretty good.
Coloring gun recesses with Crayon