Modeled in 3dsmax. Rendered in LuxRender (v1.0RC3).
The main shape here is made possible with the help of the Megabevel modifier plugin, and the Graphite modeling tools in 3dsmax. I also used Mathsurf 2 for the other shape beneath it. I'm sure everyone knows by now how to do the Voronoi cell topology, so I won't bother explaining how I did that.