maybe it could be like how aphex twin hid a picture of his logo in (symbol)? i don't know much about how it's done.

nah, that sort of effect has a really noticeable sound.. since the sound is literally drawing the picture with various frequencies, it tends to have big sweeping sounds with lots of high pitched stuff..

but i do have a program for doing that, so i guess i could check it out..

scratch that.. i only downloaded a 10 day demo and it has expired.

here's the program if anybody else wants to try it: http://www.visualizationsoftware.com/gram/gramdl.html