If you don't mind paying for a plugin
BadTV will get you there.
Otherwise, I would look at mosiac effects, displacement maps, fractal noise and probably a lot more.
Johnny Cuevas, Editor
Thinkck.com
"I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work."
---THOMAS EDISON on inventing the light bulb.