Greeble Workshop v1.0
Ref: Based on Particle City Generation from Andrew Price
and Displacement maps made from floating geomerty saved out as OpenEXR files.
OpenEXR was developed by ILM, so you know it's got to be special... And it is... As a grey scale hold tons more information than your standard jpg or even tif and targa. OpenEXR is also used in HDRI lighting. Raw they are 64mb from a 2k(2048x2048) image. I suggest using the zip losless to get them down to a 6 or 7mb file. NB. Save RGB not RGBA or you will get a big black square when you bake!!
See Oliver Villar's tut
using Michalas's from blenderartists.org displacement method.
Instructions included in a text file in the blend, read them and watch the videos. High rez brought to you by Flickr...