I found this interesting page via Create Digital Music. It’s a bunch of Youtube videos that are all in the same key and all have an ambient quality. You can play them in any order you like, you can adjust the volumes of each clip, and you can alter the playheads as you wish. The result is a beautiful soundscape with you the listener feeling like you were part of the process. Brilliant.
Here it is: http://www.inbflat.net/