A tool to customize icons, xrdb and GTK themes. 

Graphical application for generating different color variations of Oomox (Numix-based) and Materia (ex-Flat-Plat) themes (GTK2, GTK3, Cinnamon, GNOME, Openbox, Xfwm), Archdroid, Gnome-Color, Numix, Papirus and Suru++ icon themes. 

You can apply your themes in lxappearance. 

To run: Menu -> Graphics -> Oomox Theme Designer
To run in a terminal: oomox-gui