C. Z. Lovecraft. An excellent A.T.C. (which I positioned next to the cool, blue card protector in which it was shipped...)
What I think Lovecraft (C. Z. not H. P.) does so well is take items that would not be spectacular on their own, and places them into a new context by mailing them. Receiving an envelope full of stickers, balloons, cut up adverts and images, and other bits and bobs makes you contemplate each item individually and without the aid of the environment in which they would normally exist. It's certainly a continuation of the "found object" school of art and one I particularly enjoy.