Where to start
Now that you know a bit more about fractals, you are probably wondering how to produce these with Ultra Fractal. By default, Ultra Fractal opens with a standard Mandelbrot fractal, so the easiest way is to take this fractal and start zooming.
Ultra Fractal has many more possibilities, but it is a good idea to start with simple zooming to get a feeling for what fractals are and how Ultra Fractal works. Also, be sure to work through the tutorials to learn more.