My testing work for X11:Enlightenment:Factory
Simotek the wallpaper for 13.1 is the same as it was in 12.2. If you are subscribed to the artwork mailing list you might see a new version of this wallpaper being shared by Ilmehtar in the near future. But if not, go ahead and use the current default wallpaper.
Open Build Service (OBS) is an openSUSE project.