Droste Effect
From Ultrafractal Wiki
Droste Effect is a Coloring Algorithm in jos.ucl which implements the Droste Effect.
Some of you may have used the Droste Effect transformation. There is now also a Droste Effect Coloring Algorithm that takes advantage of UF5's image import and manipulation possibilities.
This Coloring Algorithm can do the same as the transformation (which is of course still available in jos.uxf), but adds the possibility to work with almost any shape, whereas the transformation could only handle circles and rectangles. This Coloring Algorithm needs an imported image to work at all, and should be used with the Pixel formula..
There is a short tutorial here
Jos Leys [1]
