The latest edition of Ubuntu 13.10 titled Saucy Salamander was released just a few days ago. With it came a beautiful pack of new wallpapers created by the open source community. You can find them and download them above.
Category: Ubuntu wallpapers
Wallpapers for the Ubuntu OS distributions.
Ubuntu 13.04 Raring Ringtail wallpapers
A bit late bit here there are, the wallpapers included in Ubuntu 13.04 the raring Ringtail edition.
Dandelion theme (wallpaper plus Firefox persona)
Now this looks pretty awesome if you ask me.
You can download the wallpaper below and use it as Google background as well as for your desktop
and use this firefox persona.