I recently checked out a fractal tool called Mandelbulb 3D (http://mandelbulb.com/). it is a really funny tool to find random shapes you can use for cocnept art, matte paintings or make some cool motion graphic stuff. i kind of like the happy accident moments you get while playing around with the values.
here is one of my first try. (photobash over the mandelbulb´s render)
|Mandelbulb 3D - render|
|"city in the clouds"|