
In Philadelphia a group of people used Kickstarter to successfully fund the MIDI Sprout, a device capable of turning the biofeedback from a plant into midi that can be set to scales to control your synth.
"This is the beginning of the global DIY biofeedback movement."
How it works

The MIDI Sprout converts these fluctuations into MIDI notes and controls that can be read by synthesizers and computers. This information can be scaled and played through synthesizers or used to activate pre-programmed sonic environments.
Links
Using MIDI Sprout with Moog Synth; https://www.youtube.com/watch?v=WN833bCXXJk
Kickstarter ; https://www.kickstarter.com/projects/datagarden/midi-sprout-biodata-sonification-device