The Fedora Design Team has for the default wallpaper and artwork for Fedora 19.
The codename for Fedora 19 is Schrödinger’s Cat, and the Design Team usually tries to make the default artwork and wallpaper tie into the codename somehow.
Sadly, however, cute pictures of cats in boxes do not make good *DEFAULT* wallpapers.
So leave a comment here with your ideas / brainstorms / links to images for how to make a default wallpaper that ties into the codename!