I recently bought a neat little midi controller called the Hot Hands.
It’s essentially a little ring that you put on your finger that sends accelerometer data to your computer. It measures positional change in the X, Y and Z axis. This change can be mapped to pretty much anything in the universe. I chose to connect it to some expressive knobs in a Reaktor module called S-Layer. It was surprisingly fun to twist and vibrate some new sounds out of this already interesting plugin. It also gave me ideas for gestural control of sound in a VR environment. Good times!