Have you ever tried this?
You basically listen to the natural sounds around you through an effects processor.
All you need is a microphone, ear phones, laptop, and a backpack. Run the mic through the laptop, filter it through some effects, and listen to it through the ear phones.
It's portable. You can walk around like this. You can meditate like this. Parties. It's really synergistic.
I use Ableton Live. I'm not sure what other software does this. A battery-powered effects pedal works too.
You can customize the world to sound like anything you want. The supply of VST plugins out there is limitless.
Favorite is Glitch (it's where the name comes from http://illformed.org/plugins/glitch/
Delay is awesome. And pitch manipulation. Harmonies. I haven't even tried Autotune. Or sending Beethoven through a vocoder. It's a new way to experience music. If your mic is sensitive enough, drumming on your body is really amazing.
It's awesome to do with multiple people. Like, one mic broadcasting to several ear phones (splitter or FM transmitter or bluetooth? or wifi?). Get the delay looping and you'll have a collective musical experience.
With a camera and video goggles you could do visual glitching.
Combine it with data from an EEG and you can get yourself into incredible feedback loops. (should be able to get one soon) Imagine hooking up several people's EEGs together?
This is like... the future of Psychedelia.
You can try this right now. Let me know if you need any help setting it up.