GTK MATE theme: http://gnome-look.org/content/show.php/CDE-Solaris?content=19627. This is a lovely grey theme that themes the GTK interface to look like CDE. The Metacity theme that completes the CDE look: http://gnome-look.org/content/show.php?content=18870. This is perfect if you want a retro looking Linux Mint 15 MATE desktop. Blue Sun GTK theme: http://gnome-look.org/content/show.php/Blue+Sun+GTK+Theme?content=93650. This is a very dark and attractive GTK …