Hmm... you have *tons* of choices when it comes to UNIX desktop
KDE
KDE is a powerful graphical desktop environment for Unix workstations.
http://www.kde.org/
=> EyeCandy for your KDE Desktop. Visual Enhancements for your KDE Desktop: Wallpapers, Icons, Themes.
http://www.kde-look.org/
Gnome
Another user-friendly (powerful) desktop for Unix operating systems
http://www.gnome.org/
Gnome look, wallpapers and other sutff:
http://www.gnome-look.org and
http://www.gnome-look.org/
Above two or major desktops for UNIX and Linux systems