This is the result of the involuntary merger of three themes.
The icon set is called Ultimate Gnome and was made by Newmoon. It can be found at http://www.gnome-look.org/content/show.php/Ultimate+Gnome?content=75000. His website is http://mtcomic.blogspot.com/.
The GTK theme is called Glossy P by m5brane, and can be found at http://art.gnome.org/themes/gtk2/571. Viciouslime has made a bunch of color variations of the theme. You can check those out at http://gnome-look.org/usermanager/search.php?username=viciouslime.
The Metacity theme is a creation of Aitvo called MetaTivo 2.0, which he says is based on Aquativo, which he also made. It's located at http://art.gnome.org/themes/metacity/782. His profile at Gnome-Look has some other versions of the theme.