In the past I have done some explorations with double, triple and quadruple pendulums.
Spring pendulums are similar to the previous double, triple and quadruple pendulums, but the fixed length pendulum arms are replaced with springs. This leads to more complex plots.
Here are some examples of a double, triple and quadruple spring pendulum.
To make the plots a little clearer, here they are again with only the pendulum end points being traced.
Spring pendulums are now included with the latest version of Visions of Chaos.