I just managed to write an implementation of the universal automata rule 110 in paintfuck (plenty of discussion and snippits on the linked page as well), a thoroughly delightful graphical programming language (that’s borderline-esoteric).
( source )
It’s flash-based, and very easy to play about with to produce nice/interesting patterns :)
EDIT: tinkered with the code so that it doesn’t erase itself as it goes down now :)
It’s pretty slow on my computer, so here’s a capture of it after the first couple of lines, for those without too much patience:
