I have used Blender 2.69 and Cycles.
It is a 3D Clifford Attractor.
I have created a python script to make a Bezier curve with 900 vertices. You can find the script in http://blenderartists.org/forum/showthread.php?325717-This-is-the-code-to-create-a-Clifford-Attractor-%28Bezier-Curve%29
