Ever since watching Duncan Brinsmead's video, I've been fascinated by the Mandelbrot Set, and the subsequent Mandelbulb and the newest Mandelbox.
I found a very old program called Mandelbulber... I rendered out something simple... not bad really...
For Reference:
1979 Mandelbrot Set (BenoƮt Mandelbrot) - zn+1 = zn2 + c
2007 Mandelbulb (Daniel White and Paul Nylander) - See The Unravelling of the Real 3D Mandelbulb for details.
2010 Mandelbox (Tom Lowe) See What is a Mandelbox for more detail, particularly the gallery.