I had a similar problem with Tanner when he was teething (although he didn't chew any of my art work). I did a couple of things that seemed to help (a little). First of all I bought a baby teething ring (plastic with no filling). The ring had different textures on it and he seemed to like it. The other thing was that I played with him regularily using an old oven mitt. That way he could "attack and chew" without serious harm to my hand.

Good luck with Sammy, but I will tell you that he will eventually grow out of this. I know that probably isn't much consolation right now.