Sven Havemann's PhD on "Generative Mesh Modelling"[0] is brilliant. At this point, it could be implemented on top of Blender 3Ds newest modelling kernel.

In general, stack languages are great for graphics in both 2 dimensions (PostScript) and 3 dimensions (GML)[1].

[0] http://digisrv-1.biblio.etc.tu-bs.de:8080/docportal/receive/...

[1] http://en.wikipedia.org/wiki/Generative_Modelling_Language