You'll wanna turn down your volume because the audio is really harsh, but here's a little something I created on the spot while hanging out at a small EDM show in the middle of nowhere...
It reacts to the microphone input on the laptop and is actually a much more complex scene than what you see, but the video only shows it with a kaleidoscope effect applied. Usually I would throw stuff like that up on projectors or other screens and then utilize the laptop screen to control more of the action, but I didn't have anything like that with me so I just set it up to run on its own.
By the way, I'm really impressed by the other work in this tread. I especially envy the drawing skills up in here. Drawing is something I admire, and I wish I'd get in the habit of drawing more myself.
Hopefully after seeing my crappy excuse for art, others will be more motivated to post their stuff, too!