"Roll up! Roll up! It's time for Chimp's Lucky Dip! Everyone's a winner! (...) A beautiful, one-off, hand crafted "Human Bein" painting is the prize for everyone who takes part. It's a gamble, but not much risk, as each of these paintings is great. The risk element, and the trust, comes from the fact that the only way to get one of these is to mail me 20 euros cash! Are you willing to put your trust in the Postal Service, and put your hard earned cash into the hands of a stranger...?"
If yes is your answer, go to the Chimp's website for more information.