For several years I have been playing around in Photoshop making fake tilt-shift photographs, with decent results, using the quick mask and gradient tools.
These images represent an experiment with the Nikon PC-E 45mm f2.8 perspective control lens. The lens offers a full range of tilts and shifts allowing the user to control the angle of the focal plane.
The applications for the lens could range from architecture and food. I will be incorporating it periodically when shooting news and people. I think using it sparingly will slowly introduce another authentic technique to my photography and teaching bag of tricks.
See more tilt shift images here.