To Explain My Guilty Pleasure
Visit this website. Can't vouch for anything else on the site, but she's generated some incredible images. See the "Ultrafractals" for some Mandelbrot manipulations and magnifications. Xenodreams is not strictly speaking a fractal rendering, but it does use fractals for some of the images, and these are lovely. My work is much more mundance, but if you're interested in the stuff, it is all mesmerizing. And here you will find the Internet Fractal Database.