One of the last gems I found on TUAW was Artful, an app that serves you classic works of art for your desktop background. The concept intrigued me.
Artful (U.S. $4.99) is a well thought out app that lets you have any of thousands of public domain artworks as your desktop based on parameters you select.
Most art is too busy for my backgrounds, but there are some that work. I understand the appeal. ∞