What is the value of your beauty, or all this beauty around us in this terrible harmonious universe if there were no one to evaluate it .... do you really believe can something be for another thing like that by acocidance !!!!?
The Mandelbrot set and its relatives, are beautiful and infinitely complex. They exist due to mathematical concepts independent on human existence because 1+1 doesn't need a human to be true, it just is. As for their subjective beauty relative to other things... that is in the eye of the human beholder. But it certainly doesn't require the existence of "God" in any shape or form.
The Mandelbot set: [wikiwand.com]
Video showing it: