Vimix is a flat Material Design theme for GTK 3, GTK 2 and Gnome-Shell which supports GTK 3 and GTK 2 based desktop environments like Gnome, Unity, Budgie, Pantheon, XFCE, Mate, etc.

This theme is based on Flat-Plat gtk theme of nana-4. The theme offers:

• dark theme, dark doder, dark ruby.
• light theme, light doder, light ruby.

Following pictures are Vimix theme with Numix icons in Unity Desktop (with plank):

Vimix Light with Numix icons (Unity with Plank)

Vimix Dark with Numix icons in Unity

Install Vimix GTK Theme in Ubuntu 16.10:

The theme project page offers .deb and .rpm packages for Gtk 3.20 and Gtk 3.22. So you need at least Ubuntu 16.10.

Download Vimix Theme (Gtk3.20)

For other Gtk3.22 or other packages, go to github.com.

After installed the .deb packages via Ubuntu Software or dpkg command, launch Unity Tweak Tool, Gnome Tweak Tool, or other configuration tool and apply new GTK themes and enjoy!