My Dad and I are doing a generative art experiment with his HP-7475A pen plotter.
I wrote an application called Axo which is a graph-based programming tool that outputs paths to be converted into HP-GL, SVG, or G-Code (we've used this for engraving with a laser cutter). Axo is an homage to Reaktor, Patternodes, ArtMatic & Max, all applications I have enjoyed using.
Here's a gallery of some of the bits I am happiest with so far: https://axo.mattmower.com/projects/mausart/gallery
At some point I want to pair the virtual image with a picture of the real-life plot. Some of the plots look great on nice paper.