Applying tilt shift to a picture.

Tilt–shift photography is the use of camera movements on small- and medium-format cameras, and sometimes specifically refers to the use of tilt for selective focus, often for simulating a miniature scene. Sometimes the term is used when the large depth of field is simulated with digital post-processing; the name may derive from the tilt–shift lens normally required when the effect is produced optically. 
I have always liked the effect for several uses.  My favorite might be a large scenery photograph centered on one point to make it look like a small scale.  I also like it in pictures of a subject to make the subject clear with everything else out of focus.  What I found is there are some wonderful filters online to do this. is my favorite.  You upload your picture, play with the settings and download it out, for free.  Rather awesome really.  Here is a before and after of my daughter, it was a good picture to begin with (IMO) but I like the result as well.