Ok, maybe this is a kind of fun for freaks - but I'm sure you all read my profile yet, haven't you? ;)

Ever thought of how it is when you take LSD or such stuff? Tasting the geometry of the things around you? Or hearing images?
A few guys gave it a try and developed this little Java Applet: upload images of 64x64 px^2 in size and listen to them. First I thought they'd perform some 2D FFT, but they are not. Just go there and find it out for yourselves!

http://www.artificialvision.com/javoice.htm

That comes quite close to listening to fractals (go and download fractint.exe - somewhere among the tons of options you can switch on sound - quite cool stuff!) - There is even a fractal on this site (the fractint stuff is much better, though): www.artificialvision.com/sierpinski.gif