The zipfile under the image above contains a Pure Data patch which procedurally generates a virtually infinite number of acid and breakbeat loops. I've found that it's quite a lot of fun to play with!
Start by loading the patch called 0_START.pd and then turn up the volume and the cutoff. After that hit the big red button a few times until you hear something you like.
I was making it into an RjDj scene, but I am not really sure if I'll ever get around to finishing it.