I have recently started making a few of these fine creations. What do I do with them? Why trade them with other artists of course. Where do I do that? No other place than Craftster.org, of course! I am currently in the ATC Swap over there and loving it.
There are so many different techniques people use to make ATCs, it's just amazing. If you want to check out some of these great techniques, head on over to this Craftster post or just check out their ATC Board generally. Another great place to check out ATCs is over of Flicker. I just did a search for ATC and this is what came up. So much great stuff. ATCs are also great for scrapbookers who have lots of little bits left over and nothing else to do with them.
*None of the ATCs picture are mine, but I am planning on uploading examples of my stuff later.