This photo belongs to Henry Engelbrecht, from Trekearth (http://www.trekearth.com/members/henrye/)
I modify my other GDM theme – ubuntu africa - and changed the background photo and the location of the menus!
So this keep being a modification of “drop impact” (http://www.gnome-look.org/content/show.php/Drop+Impact?content=100652)
Hope you like it, and please leave a comment! =)