I have put up a bunch of my personal designs on Redbubble.com for purchase.
What a neat site. I download their template and put my work in it. Then, I upload the saved design.
It is immediately available for purchase on tons of different products. Tshirts, hoodies, kids clothing, and my favorites, stickers and Iphone cases.
Eventually I will be adding all of my greeting cards and wall art.
Check out my profile at http://www.redbubble.com/people/shinymetalthing