I added bookmarks to Fractal Play! Clicking the link will load it in this configuration, and you can make changes from there. Here's one that's close to what I used for my profile picture: morrna.github.io/fractal-play...

If you take the Sierpinski triangle, flip the top triangle upside-down, then play with the skew and rotation to make it curve a bit, you get something a bit like a Klingon bat'leth. (Fellow Star Trek fans will understand.)