I have made a L-System (Lindenmayer System) available on the Squeakland BBS.
http://squeakland.org:8080/super/357
To load with Squeak plugin: http://www.squeakland.org/project.jsp?http://squeakland.org:8080/super/uploa...
It's mainly a implementation of the system described here: http://instruct1.cit.cornell.edu/courses/bionb441/LSystem/
Enjoy growing trees :-)
Karl
squeakland@lists.squeakfoundation.org