TRON Legacy GDM theme: http://gnome-look.org/content/show.php?content=117133. This will also work with MDM in Linux Mint 15.
TRON Legacy Gnome Shell theme: http://half-left.deviantart.com/art/GNOME-Shell-Tron-Legacy-208220836. This theme is very reminiscent of the theme that the computer uses in the movie. You need to install the User Themes extension to load this theme.
TRON Legacy lightcycle wallpaper: http://www.moviedeskback.com/wp-content/uploads/2010/07/Tron-Legacy-Wallpapers-1600×1200-6.jpg.
Die Hard 4.0 theme for Linux: http://gnome-look.org/content/show.php/Die+Hard+4.0+GTK+theme?content=84355.
Die Hard 4.0 Beryl Emerald theme: http://gnome-look.org/content/show.php?content=66714&forumpage=2.