Wow, cool! I think I remember a post years ago about this project. IIRC you did a thesis in something to do with simulating brush strokes? Anyway, congrats on releasing this, super impressive to have worked on this for so long and come out with something that looks so good. (And it's awesome that you're looking into using Vello too.)
You remember correctly! Here's that thesis code <https://github.com/Keavon/Brush-Nodes>. You can ignore the readme since it doesn't talk about brushes and open the GitHub Pages site (or, I can just link it here: <https://keavon.github.io/Brush-Nodes/>). Then press Ctrl+1, Ctrl+2, Ctrl+3, or Ctrl+4 and reload the page after each. Be patient as it takes a couple seconds to load the page once a demo is chosen. That'll load the four brush demos:
