Watched Upside Down yesterday and got inspired by it. I was amazed with the effects, and all the graphics they did for the movie. It was incredible. I want to try doing it on Photoshop, so I gave it a try. :D
The building on top is from http://www.desktopas.com/city-buildings-1920x1200.html
And the building on the bottom is from http://www.planetminecraft.com/texture_pack/falling-skies-1262768/.