Stanford’s 3D tool where you can upload your own 2D image and make it 3D (site seems to be getting hammered at the moment)-

Make3D converts your single picture into a 3-D model. It takes a two-dimensional image and creates a three-dimensional “fly around” model, giving the viewers access to the scene’s depth and a range of points of view.

It uses powerful machine learning techniques (more details here), to learn the relation between small image patches and their depth and orientation. This allows it to model 3-d structures such as slopes of mountains or branches of trees.

Make3D — convert your images to 3d – [via] Link.