Some reference images:
http://imageshack.us/photo/my-images/167/fallout3200811241757226yt8.jpg/
http://fallout3-capitalroads.blogspot.com/
and of course, a nice tutorial:
http://blendersushi.blogspot.com/2012/07/vfx-dynamic-paint-procedural-cracking.html
used
- sapling
- cell fracture
- cloud generator
- ant landscape
- curve/path
- hair particles
- mist
- no compositing
- no cycles
