Flame fractals are even less “designed” than the more traditional fractals based on complex equations. There you tend to start with a fixed formula that you know looks good, and then find a nice region to render. With flames you normally just look through randomly generated starting points, sometimes ten, sometimes maybe even a hundred until you find one that looks good enough to investigate further. Then you tinker with the parameters, a nudge here, a colour change there, iteratively making it “better”. Sometimes of course one of the random images looks absolutely great and no amount of changing will improve it.