Some time ago I published some images of 3D diffiusion limited aggregation 
that included constraint surfaces. 
   http://astronomy.swin.edu.au/~pbourke/fractals/dla3d/
Since then they have also been exhibited at the Simply Complex exhibition 
in Zurich. 
   http://www.museum-gestaltung.ch/exhibitions/program.html
A few people asked for the programs that created these forms, I have put a
beta version for Mac OS-X and Linux here, you also need POVRay to render
the structures, see the bottom of this page for the downloads.
   http://astronomy.swin.edu.au/~pbourke/fractals/dla3d/
-- 
Paul Bourke
pdb_NOSPAMswin.edu.au

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