I couldn't find it anywhere else on the web, so I decided to upload it here directly from my computer. It's quite nice in my opinion, and I wanted to put it on my Mac (I use the mac for Skype video).
You can find it on your Feisty computer under /usr/share/backgrounds/warty-final-ubuntu.png . I have no idea why it's named that (that was the name of the ugly brown warty theme), but it's obviously some beta thing that will be changed... OR WILL IT?!?!?