One of the first things that I missed when I realized that my laptop was lost was (beside tons of photos and college documentation) a couple of old hacks, most of them on pygtk, more than a year ago I started lurking on the #art-gnome channel trying to add atom feeds to art.gnome.org, benzea did a great job adding support to art.gnome.org back then. Once the support was added, I hacked a small pygtk app to use the feed to select backgrounds from the site and apply them without browser interaction.
Fortunately, there was a copy of the hack on my gmail history, and Jilorio backgrounds has come alive again. Check out the git repository or the 0.1 tarball.
If you are looking for an easy hack, metacity and gtk themes variants of the app would be really cool. Any patch or comments are welcome.