Reality Building Design - http://www.realitybuildingdesign.co.uk
My "go to" architectural model gets a different sort of treatment this time following this excellent tutorial http://www.alexhogrefe.com/blog/2012/9/9/sketches-part-2-extended.html
This image http://fav.me/d2reokf was used in the making of this
Modelled - sketchup
clay render - kerkythea
post pro - gimp