I just found an app on Flickr called John’s Background Switcher. This is exactly what I have always wanted. Move over WebShots because this is so much better that you can’t hold a candle to it!
John's Background Switcher
I also had a good laugh at the credits at the bottom of the page:
“This site is powered by WordPress and bbPress with hosting from Joyent.
Design by John Conners, who is powered mostly by coffee.“
November 6, 2009 at 08:01
It would just be great if you could use it as a screen saver too.