The Muse SDK would lend itself to creating a neurofeedback app that generates the right binaural beat frequencies to entrain the brain to descend into a meditative (or other) state. Similar to what Sleep Shepherd Blue is doing (http://sleepshepherd.com)
Obviously you can't sleep with the Muse headband on (and the battery wouldn't last all night even if you could) - but using binaural beats to entrain the brain into a meditative state seems like an interesting project.
Alas I lack the development skills to write this, but would be happy to provide feedback, etc. to anyone interested in working on this.