(Project completed: 1994)
This program uses a controlled random walk to draw shapes that resemble various types of fluffy flowers like goatsbeard or dandelions in their seed stage. The purpose is mainly to demonstrate an algorithm - have a look at the included source code. For simplicity, the program uses floating point math.
If generation of plantlike shapes is your cup of tea leaves, I recommend you check out the work of Dr. P at the University of Calgary. His main focus is on plant rendering.