The Emboss coloring algorithm interprets results from one of the Embossed fractal formulas to create fractals with 3D contour lines. It is unlikely to give good results with other fractal formulas.
See Embossed (Julia, Mandelbrot, Newton) for more information.
Emboss is available as a coloring algorithm in Standard.ucl and as a coloring plug-in in Standard.ulb.
Standard coloring algorithms