I have a pin made by an artist/musician friend of the hellhound that I used to have on my strap. A grand tradition. If I can find it I'll post a pic. Looks a lot like your carving...and it's green!

I am trying to picture the mixture of JP and FM... would have liked to hear that ;-)

This one's not bad either

Aside from the carving challenges, how will you keep the guitar from chewing off your strap button?