I’ve spent much of today playing with a fun technique called “tilt shift” — you can do it with lenses or Photoshop, but either way you get the same effect: normal size objects appear to be miniature models of themselves.
It’s not remotely difficult to do — just select everything but a thin feathery strip of the image and run the lens blur filter. Everything in that one visual plane should be sharp, but nothing else should be. (Paint back in some of the lost detail with the history brush if necessary.) Add a bit of grain to the blurred areas, crank the saturation to a 1950’s Technicolor level and you’re pretty much good to go.
This technique works best with photos shot from a high-ish angle, and will give particularly good results with fairly regular subject matter such as buildings and careful landscaping. Also, England. I think it’s the combination of UK architecture and the very green grass there, but the country just seems to lend itself to being converted into tiny model villages.