Modeled in 3dsmax. Rendered in LuxRender (v1.0RC3).
The featured shape here is based on an original sculpture concept created by Bathsheba Grossman, called "Metatron". She's created many real-world sculptures using this shape. There's also been many other derivatives of this twisted double-tetrahedron family of shapes I've seen done in apps like Topmod and other topological modelers. This one is all 3dsmax, and began as a tetrahedron primitive. Textures compliments of cgtextures.com and other free repositories.