ACEO's on Etsy
I just found out what ACEO's (Art Cards, Editions, and Originals) are and have started making my own and selling them on my Etsy site. They're business card sized (3.5 by 2 inches) pieces of art that you can buy or trade. It's a great way to own some original art by someone you've always enjoyed without breaking the bank.
Here's a sample of the series I just created. The rest are up on Etsy.