Tilt shift photography uses a special lens to make it look like the pictures you've taken are of miniature models. But recently I ran across a website that produces the same effect from regular pictures.
http://tiltshiftmaker.com/
I tried a few, I think they turned out okay. It's something I'm sure I'll play around with more in the future. I think that the picture you start with goes a long way towards deciding how good the end result will be.
