If you happen to have an HPGL plotter hanging around, you should be able to use it, just change the serial port in Plotter.cpp.
The parameters are at the top of ofApp.cpp (bad habit) and there are a few in Plotter.cpp that you might want tune for the size of the drawing.
I got all my L-system rules from here:
http://www-user.uni-bremen.de/~schmuhl/fractals/fractal_curves.html
You will need ofxCv and ofxPosterize

