The user SlyDeath from KDE-Look.org share these wallpapers:
Although there are still some distros missing like Ubuntu, Fedora or some more 'modern' ones like Mageia or Pardus, it cannot be denied that the ones that exist so far are quite interesting 
Anyway, it's a short and simple post because the goal is not to give you a full explanation about the wallpapers, but rather to share them 
Enjoy them!
regards