I've read about the no-input approach a while ago but never tried it. But if you searching for Modules who are producing a lot of noise, then take a look at the endorphine Milky Way and the Squawk Dirty. They are notorious for being noisy.
To farkas point. The Bastl Dark Matter does weird stuff and creates feedback loops, but i think it needs an audio source. I guess that is not what you want to do.
One Module who could be interesting is the Instruo Lion.