I started a CafePress shop. And I found their coffee mugs to be only "decent quality" product they make. (Their T-shirts suck! Unless you like $20. rags with your fav images on them in three months)
So, I'm sticking with coffee mugs (and a couple of book bags).
At first, I just had my paintings and illustrations proportionally printed on them. But then I discovered their wrap-around template. Now, I've been going nutty with creating new designs for each mug. It's been a blast!
Check these out:
http://www.cafepress.com/slatts_shop