So the whole fake tilt-shift miniature trend is probably about 2 years stale now, but I was browsing though some old photos and found a few candidates for the look so I figured I'd try it out.
The effect is good on one of these images (the rooftop minus the dude) and just OK on the other two, but you get the idea. It's funny how some selective focus can trick the eye into thinking it's looking at a miniature. I'm sure there's a physiological explanation as to why this happens, but I'm too tired to look into it right now. Instead, take a peek at this link if you want to find out how to do this yourself:
Choosing a good image for the effect is pretty critical. I think the ones that look the best are taken from above the subject, looking down at a shallow - to 45degree angle, an angle that mirrors the angle you'd be looking down at a miniature from. Search Flickr for examples, there are a ton of groups dedicated to this style of manipulation.
Here's my try at it (click the images to enlarge):