Playing with fractal generators can result in images that remind some of creatures in the natural world. Did you know that the nudibranch^ can be evocative of certain Julia-set fractals? Especially when you see them in motion. Be sure to check out the "scubadiving" and related YouTube tags for other deep-sea creatures. I especially liked this one.
Search for the Loch Ness Monster, one of the dozens of classic articles written by Scuba pioneer and legend Walt Deas.
The art of ZenScuba, as practiced by The Zen Diving Organization. Cute. I like the MahaGamera Mandala.