I was messing around last night and found this:
Create a flat grid of (say) 10 x 10 verts.
Make sure you are in Edit mode with the grid selected.
Now go to the object menu>scripts>Discombobulator and hit the "Discombobulate" button.
This is what you get :
Instant cityscape !
By chopping out buildings to get streets you could get quite a realistic city
You could also use it for interesting surface effects as in Death Star surface or other Sci-fi type encrusting.
Hope you find this useful!