As someone ask me on blendernation, I share the scene of a tutorial I made last month. This is a making of a view of a city rooftops. The roofs of Paris, because it sounds good and because it's famous. You can read this tutorial/making-of here : http://www.bjobernis.fr/news/post/displace-and-groups-modeling-tip-en
I hope you'll enjoy it. Please share your works you'll make from my scene, I would enjoy them.