I like L-systems. A few years ago I wrote an L-system which displayed a Koch snowflake in postscript, for one of the early TPJ obfuscated perl contests, but I don't think it qualified due to the postscript. Maybe I'll post it in the obfuscation section if I can dig it up.
Unfortunately, since then, I haven't found any good turtle-graphics style module to support interesting L-system output. There was (is?) a Graphics::Turtle module (or something similar) in CPAN, but according to the author it was an idea, not an implementation.
However, using postscript for turtle graphics output is pretty easy, if you don't mind using a postscript viewer to look at the output. Instead of rotating your "turtle" and calculating a new (X, Y) based on your angle and a fixed radius, translate your current position to (0, 0), rotate the world around the origin, and then draw a line to (say) (0, 1). Using postscript as my output device, the snowflake generator was under 4 80-character lines long, including unnecessary obfuscation and without any external module dependancies.
I hope this provides some inspiration :) If I don't find my old postscript L-system generator maybe I'll rewrite it and post it here somewhere.
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