This Arduino Nano(2x)-based design caught my attention as it reminded me of one of the first gesture control robots demonstrated by TI at the Embedded Systems Conference (ESC) in 2011. In the demo, the University of Illinois's Segbot controlled with TI's Chronos watch. Here’s a video that I took at that time.
The technology has gotten cheaper and better since that time. Here’s a tutorial to make a similar gesture control robot from DIYBuilder.