Hang Art and the Hang Art Annex
We got a good tip on an art gallery in San Francisco called Hang Art Gallery. There are lots of beautiful images on the website and while much of the art comes with high price tags, for inspiration (and for those who have the cash) there are some great pieces.
Hang Art also has a rental service where you can try out a piece of art for up to 3 months to insure your happiness with the work in your home.
Thanks for the tip, ebrown!