The Last Sundown GDM Theme
This is not my original work. I took the ArchDark GDM Theme, changed color, and added new background. Almost all of the XML coding as well as design for the "log in" part was done by the authors of the original ArchDark GDM.
ArchDark 0.2 - http://www.gnome-look.org/content/show.php/ArchDark?content=94030
Visit my profile page to see other GDM themes and other artwork.