Vulpestruments just announced the completion of the Droneitar, a two-stringed instrument that has drone strings powered being continuously plucked by a string attached to an electric motor. In fact, the coils from another electric motor are used as a pickup for the device. Rich Stephenson demonstrates the sonic possibilities of the Droneitar in the video.
The Droneitar is made entirely from repurposed materials, from the wood that makes up the body, to nails being used as frets. Despite this, the instrument has a great, vintage look, and the sound speaks for itself.