I've always found the artwork of convicted murderers to be rather creepy. Especially when it's the artwork of serial killers like John Wayne Gacy...
You don't really get a sense of just how creepy some of this stuff is until you see it up close at an exhibit. When it's inches away from you the creepiness just jumps right out at you.
And if you have money to spend and you want something ghastly to hang on your wall, you can go here and start placing your bids...
Artwork - Murder Auction