I announced the new version of my art code yesterday, and a new slew of solid geometry stuff and hooks to my art shell was part of it. So here's a little bonus treat made with these things:
"large red fish fills portland dodecahedron at center"
Implementations of the Archimedean solids plus a few other fun ones and an integrated better 3D rendering of them. Pens. Hobby curves.
There's also a lot of future-looking infrastructure here (see: "maker functions" in the release notes), a fair amount of clean up, performance, etc. Click the "browse" link for detailed release notes.