I had this idea a while ago, and wanted to see how it will turn out. I used some 3d trees, and modeled with very basic geometry.. the tree in the front is a simple cylinder.

I converted all objects into Proxies, and textured all the gras and trees before converting.

The Alien Stuff was scultped in Zbrush - and also converted into proxies. DOF is post with Photoshop.

All done with 3dsamx, Zbrush, After Effects, and Photoshop.
Rendered with Vray in RWF.