3D Fractals

More and more each day I'm impressed by the power of various computer tools I like to use and explore. Fractals are the entities I love, and above are three images that show 3D fractals. The title of the first one is Strangeland, the one in the middle is Atlantis, the one below is, of course, Fractland.:)
(Click to enlarge.)

There's a lot of books on fractals, one recommendation:
C.A. Pickover, The Pattern Book.
Another recommendation: B. Mandelbrot, The Fractal Geometry of Nature.