For anyone interested in L-systems, here are a couple of nice examples by Fatih Erikli and Diana Lange:
https://fatiherikli.github.io/kilim-motifs/
https://www.openprocessing.org/sketch/205214
An interesting book on the subject, “The Algorithmic Beauty of Plants” by Przemyslaw Prusinkiewicz and Aristid Lindenmayer, is also available online: