Created with Ultra Fractal 5.04, using various formulae in the mt.ufm and sam.ufm folders. Specifically, I used 990807b Julia, Barnsleyish Julia and Gnarl from the former and Glyph, Trapinski and Sierpinski Plane from the latter.
This is a gift for jim373 [link] for his forthcoming birthday. Wishing you Many Happy Returns of the 8th of October, Jim!
Here is a mini feature of some of his fantastic creations: