I make the bulk of my income on Squidoo. (see my hub on how I do it and how much.)
I supplement that income with affiliate links for Amazon, Zazzle (both my own designs and other people's), Cafepress (my own designs), and AllPosters.com. Zazzle and Cafepress let you upload photos and artwork -- YOURS -- and sell them printed on various products, then you get a commission for sales. Both sites also have affiliate programs allowing you to promote designs -- yours or someone else's-- and get a small commission from any sale. I recommend Zazzle for artists and photographers.
I also have Adsense on my blogs, but they earn so slowly that I haven't made a payout threshold yet. That's something for me to work on this year!