malys creations are usually very far from the Gnome default design, and this gtk3 theme is no exception.
To use the futurebox theme, you’ll have to have gtk2-engine-pixbuf and gtk3-engines-unico packages installed. To do this on Ubuntu type the following commands on a terminal:
sudo apt-get install gtk2-engines-pixbuf
sudo apt-get install gtk3-engines-unico
To get instructions on how to use this theme, just read our guide on how to theme Gnome 3!