Here is what i rendered so far.
I've done many more things, but i have to render it to show them.
These one are mainly made with POP Networks, using conditional & cosine expressions, with some gravity & an attractor.
http://www.umxprime.com/data/works/3d/houdini/TiredParticles.mov [umxprime.com]
http://www.umxprime.com/data/works/3d/houdini/FromBoxToBox.mov [umxprime.com]
http://www.umxprime.com/data/works/3d/houdini/fracture3flipbook1.mov [umxprime.com]
Hope you'll like it.