Saw a great pic from the classic "Tomb of Horrors" module for AD&D. I decided I could make a cauldron that looked a lot like it, but not exactly. :) An "homage" to a great module.
Here's a third and final cauldron from that scene. It has some kind of special "lip" around the top and different legs. I modified it somewhat so that it would print without supports.
Used an icon from here http://game-icons.net/lorc/originals/daemon-skull.html
Also, Customizable Ripples by daozenciaoyen