I'd wanted to do something with a start and end that still made a somewhat different song every playback, but I just gave up on that and submitted what I had since I wasn't going to finish that by the extension's end.
000-the-rambler.pd is the actual song, the rest are just abstractions.
The song just goes on with an unending random melody above some chords. Wanted to do more, but alas.
The song doesn't start automatically, there are two buttons to begin/end playback.