You might want to look into a program called meta synth by unity audio,
sales@unityaudio.co.uk
which converts graphics files into audio files according to the users
definition. On another note, I tried to do some work myself using fractals
on csound, now I'm no great mathematition but I found it very hard to get
any results of any tangeable quality, if you do come up with something
though I would love to hear it. There are a couple of fractal music websites
out there, a simple search on alta vista should suffice.