Does anyone know of any p.r.n.g based on laws that govern fractal geometry?

First, I am not a programmer, so sorry in advance for my ignorance. My question is, are there any prngs or rngs that base their outcome not from random event such as keystrokes or atmospheric conditions but from a set of algorithms based on the laws that produce fractal geometry or an exponential curve.

Thank you....this may get voted down or out, but please be patient.

Jon H.