|This tremendous GTK theme has GNOME 3.6 and 3.8 versions and comes with 12 color variations in light and dark modes.|
En Ubuntu and derivatives:
sudo add-apt-repository ppa: webupd8team / themes
sudo apt-get update
sudo apt-get install mediterraneannight-gtk-theme
En Arch and derivatives:
yaourt -S mediterraneannight-theme
It is always possible to download the theme for any distribution from the page of Gnome-Look. Included in the compressed file is a document with installation instructions and details on how to configure the different styles for Nautilus, metacity buttons, and tab styles.