Ubuntu Wallpapers is a pack of desktop wallpapers that Ubuntu uses in every release. These wallpapers are usually related directly to the nickname that goes with them. For example, in Ubuntu Hardy Heron you get a picture of this African heron. In Ubuntu Intrepid Ibex you see several circles imitating the shape of the horns belonging to a goat found in Africa.
If you like the style that Ubuntu uses in its new releases, Ubuntu Wallpapers will be a very welcome edition.