Not quite as impressive, but made this one or two years ago through Shapeways, coincidentally around the time the good man himself went to visit the great fractals in the sky. Got the idea from a 90s PC demo, Panic, by Future Crew, which features a scene with a volcano-esque 3D mandelbrot.
I remember wanting to eventually make a colored version (it's the reason I chose this material, which they can't print in a more detailed manner), but it was too difficult for me to get Blender to do what I wanted. Also, it was quite expensive to make this model, that's why it's pretty low in the Y-direction. The major cause for the high price had to do with materials: I had to manually hollow it, and this was before Blender 2.6 stabilised, so no automatic wall-thickening algorithms. And I suck at it, so it's a lot - far too much - of solid inside
