F → F[-FF]F[+FF]F

An L-system plant grown in JavaScript with the simple formula, F → F[-FF]F[+FF]F, and rendered with HTML5.
An L-system plant grown in JavaScript with the simple formula, F → F[-FFF[+FF

When output as MIDI, and voiced appropriately, it can sound … interesting: please have a listen by following the link  plant_160bpm.