I’d hoped to have a working demo in here, but WordPress doesn’t like the <canvas> element, so here are a couple of static screendumps:
(for more details, see Appendix C of H. Peitgen and D. Saupe, Eds. The Science of Fractal Images, New York: Springer, 1988.)
Just found one of my old Fortran-77 fractal programs, output of which is shown above. Reminds me of the days I used to consume (and ocasionally write for) Fractal Report avidly.