It’s from the same designer who created the Adwaita cupertino theme. According to him, this is a darker version of that theme. But it have a better look than the previous one!
According to the author, Mediterranean Night is good for people who work in the computer for very long hours. Dark colors are good for your eyes. But unlike the pitch black themes we find for Linux, this theme have a good balance. If you hate pitch darkness but need something to cool off your eyes. Then, try this theme.
This theme is available for both GTK3 and GTK2. To install this theme, please follow this guide : How To install Gnome Shell and GTK themes under Gnome 3. So, what do you think about your new theme?