(this journal is restored from my backup, the images are maybe not exactly the same)
Extreme deep zooms in mostly the border of the Mandelbrot set you can find in the gallery of He use fractal eXtreme, a very "easy to handle" and fast software (which sorry not is free) for deep zooms in the Mandelbrot set and its relatives. Below some of those. They must be seen downloaded or at least in full views in order to see all the subtle details. Some of those have extreme unusual patterns without using any filters Below some appetizers, all from the the hidden depth of the border of the ordinary Mandelbrot set:
Don't forget his zoom animation It clearly shows (like the motives in his gallery) that besides the same patterns are repeated in smaller and smaller scales, also the complexity is increasing forever as the zoom gets deeper and deeper He has some more in this part of his gallery. See also the zoom animations in my journal Cool Fractal Animations on YouTube.
He has also a gallery for UF fractals and another gallery for Apophysis. He also have some other gallery. He is both a fractal explorer and a fractal artist. But for that discussion, see my journal See also my old journal Outstanding Gallery of Naked Mandelbrot motives from 2008 in the same theme.