GDM based on interpid ibex mockup by wilwil100 http://willwill100.deviantart.com/art/Interpid-Ibex-Mockup-Part-3-93585184?offset=10
sorry for the bad screenshots,my xnest was not working.
P.S : The theme is not distro specific.....just extract the archive and replace dist.png wit logo of your distribution(resize img to 20x20) and edit ibex_mockup.xml file(in the distro name section replace "arch linux" or "ubuntu" with the name of your distro)
tested for 1024x768 resolution.may work on other resolutions too.
the face browser cannot be as in the mockup because of limitations of gdm.