I found this awesome GPL linux wallpaper: http://xfce-look.org/content/show.php/Linux+Logo?content=142418 when exploring the options for xfce themes. One thing I didn’t like was the text at the bottom. No problem, being a GPL wallpaper it gives the svg source.
I set it as my desktop, because GNOME lets you use svg!, and started editing it in inkscape. I made the change I wanted, saved, closed and to my surprise my edit was already reflected on the desktop!
As for why I was looking for xcfe themes when I clearly am using GNOME, I’m researching what I’ll do once GNOME 2 is depreciated in Ubuntu 11.10