I wanted to tryout making parametric designs in openscad, and liked this;
thingiverse.com/thing:1388

But I needed an stl to process in skeinforge and work with my repstrap. I have almost recreated it in openscad. There are some differences in design but similar in outcome. Unfortunately openscad does not have a random function and does not handle recursion...

The provided stl prints a little more fragile than I'd like. And I found it's a pretty good test of a 3d printer for christmas.