Crazy, Wacky, Weird and/or Wild

In this swap, swappers will send out 1 awesomely abnormal mail-art "postcard" to 1 recipient. What is abnormal? that's up to you. What's a "postcard" and what's up with it being in parentheses? Well, I am very loosely using the word postcard, because I don't want to hinder anyone's creativity....but in no way do I mean that the swap has to be limited to a 4X6 piece of postcard weight paper with an image on one side. I am thinking more mail art. What's mail art? http://en.wikipedia.org/wiki/Mail_art

And for the final details: This is an international swap, swappers with ratings of at least 4.8 and at least 10 real swaps completed and rated.