Quite some time ago I came across an Organic Modelling package called Biowin. I have hunted on the web recently to see what had happened to it, but it seems to have disappeared which is a real shame.

Based on some selected parameters it would generate these amazing shapes that could then be rendered in POVray. I found, with a little bit of tweaking that I could create even more interesting organic shapes by changing the geometric base forms into metaballs. Shown here is one of the experimental outputs.