A collection of ringo-processing samples, ported/adapted/inspired from/by (amongst others):
learning-processing: Learning Processing by Daniel Shiffman
processing-handbook: Processing: A Programming Handbook for Visual Designers and Artists by Casey Reas and Ben Fry
turtle-geometry: Turtle Geometry by Harold Abelson and Andrea diSessa
ruby-processing: ruby-processing samples by Jeremy Ashkenas et al.