As the name implies, this is a futuristic or modern or hackerish looking theme for XFCE window decorator and manager (xfwm4).
Non active windows have a dark cyan tint, while active window is highlighted with bright green color.
This version does not use GTK colors. I'll see if I can make a version that uses them.
Original work is mine, inspired by mecha-hacking-green and some "holographic" UI examples found somewhere.