I am thinking maybe a new shader with unique methods to get geebles textured with maps. Maybe something similiar to terrain with elevator shader but different method for greeble with building vertical, horizonal levels, and faces of which side for maps. Faces of which side function in shader would work to bring several texture maps/displacement maps. Random may be implemented with it in greeble plug-in. And size of building that may use the maps specified by user. It is alot like terrain shader functions. Faces of which side = dimension of which side on the box