Originally posted by jenluckenbach
OK........let's prove just how dense I am..........where do I find "set as background"?
If you find a picture you like, for example, one in your signature, right click your mouse over the picture. Then, you should see a menu and in it, it will have an option to "SET AS BACKGROUND". Click on that and you should have a new background on your desktop.

Let me know it that works for you.