Numix Holo
Numix Holo is a theme for GTK+ 2, GTK+ 3, Xfwm and Xfce notifications. It is based on Numix and sports Holo-like colours.
To install it, download and extract the ZIP, and move the newly extracted Numix Holo
folder into ~/.themes
or /usr/share/themes
.
Note
This project is not under active development. If you're interested in taking over, just raise an issue here.