By "holon" I mean any element of an IFS; this seems to be standard IFS-speak, at least in XenoDream circles. If you're planning to extend the IFS capabilities of Fractint without removing the way it makes its current IFS types, that sounds great. There are, of course, many (infinitely many) ways to fill an IFS square solid with smaller squares and/or rectangles (these being the holons I mentioned). And altering the probabilities of these leads to the fractal textures I was mentioning. Usually, a change of 0.04 from the original numbers in 2 or more holons is enough - e.g. you add this amount to one holon's probability and subtract it from another's. A greater numerical deviation results in a more contrasty texture. Where it gets more exciting is when you consider the possibilities of ANIMATIONS from one texture to another - an IS square's fractal texture evolving from one form to another. Building interpolation cababilities into Fractint's IFS and even LS types (to animate between 2 keyframes, specifying what can be changed and what cannot,so as to keep the IFS square a square) would be another great leap.