Behold the "Mandelbulb." This is a three-dimensional image created using the Mandelbrot set, a mathematical structure whose edges form fractals. The result is something that looks like an alien tree. Which isn't surprising, since fractals emulate patterns in nature.
According to Nature, this is the "first true three-dimensional representations of the Mandelbrot set." It was created by computer programmer Daniel White from Bedford, UK. See more of his work, and get a full explanation of the Mandelbulb, on his site.