Stereograms
caleb: Have you checked
stereograph for linux? It's a neat project on sf.net. The cool thing is, it can produce stereograms for transparent objects like glass! Check the one in
this page.
That said, stereograms hit Iran around 1994. I remember getting an Iranian reprint of
Magic Eye I that had an ad about a big prize (~$4000 back then, which was worth quite a lot more in Iran) for the first one who writes a computer program to produce stereograms, before the end of the (Persian) year. I got the book as a new-year gift... Anyway, where's your code by the way?