I've listed some more of my ACEO (collectible art 2.5x3.5") collection by other artists. If you'd like to take a look - some of the pioneers of the ACEO movement on eBay most in 2005.
I also have up a new ACEO of my own.
Check all my listings out here:
http://www.ebay.com/sch/artist.jillian/m.html? (for Australia, put '.au' after .com.)