It gives me warm fuzzies being surrounded by fellow Mandelbrot lovers on this thread. I've been enchanted by fractals ever since seeing IFS ferns that someone made in BASIC on a green monochrome screen.
I've wanted for a long time to get around to generating the Mandelbrot as a 3D height map (Fractint could do that from a static viewpoint), and make it explorable. Ideally where you can change size to explore it all...