You already know ascii art
But now you need something funkier : WAV art !
Drawing silhouette with samples is a nice idea.
Not really useful, but everybody loves dinos :
Yes, these are wav files ! Check this project : http://brianhilmers.com/projects/wav-art/
And the thread where you can also found our creations : http://www.wavosaur.com/forum/audio-wavefor-art-t1359.html
New York city !!!!!