Tilt-shift photography refers to the use of camera movements on small- and medium format cameras. In many cases, it refers to tilting the lens relative to the image plane and using a large aperture to achieve a very shallow depth of field. – source Wikipedia
I’ve seen a number of these types of photographs before some are done with expensive lenses and aothers are done with post-processing in applications such as Photoshop. Here are a few I recently saw on Funtasticus – I don’t have a list of the original photographers so cannot give credit. You can view more of them on the Funtasticus post.