I can get you a list of wood I currently have, but I can pretty much use any wood. Some people even make castings out of corn cob, cherry pits, coffee beans, and a ton of other stuff. There are also acrylic blanks (basically plastic) which can get pretty funky.

There are a couple of options I might be willing to try. I seen people put a decal on the wood, then cover it with a finish (of glue) so that it'll polish and be smooth. Another option I've seen is custom made acrylic blanks with logos in them. I've been trying to find the picture that I've seen, but haven't yet.