I am playing with the VRaylightMtl, it’s a mix between falloff and noise in the material
I use a VRaydisplace in the mesh with a noise map.
C&C are welcome 8)
Hey, that’s nice! Did it render quickly? I’m asking this because more or less the same thing can be achieved with max’s native architectural material, and from my experience it works pretty well too.
it’s fast, about 7 sec.
some modifications:
I like the first one better. 
an other test:
i think it’s ok but the noise map is too blurry.