An effect I like to use on some photos is ‘Tilt Shift’ or ‘Selective Focus’, this is a way of adjusting the focus that then gives the impression of making the photo look like a toy town or model town image. This effect can either be applied as post editing (this is how I use it) or when actually taking the shot with your camera.
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 shallow 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.
“Tilt–shift” encompasses two different types of movements: rotation of the lens plane relative to the image plane, called tilt, and movement of the lens parallel to the image plane, called shift. Tilt is used to control the orientation of the plane of focus (PoF), and hence the part of an image that appears sharp; it makes use of the Scheimpflug principle. Shift is used to adjust the position of the subject in the image area without moving the camera back; this is often helpful in avoiding the convergence of parallel lines, as when photographing tall buildings. ~ Wikipedia
The link above from wikipedia explains about doing it with a camera and proper lens, but it is often simpler (some might say cheating?) just to do it with software. You might even find that your camera has this function on it as an effect or scene? I use Coral Paintshop Pro, as I like the control and options it has, Photoshop also has functionality to apply it to your pictures.
My personal findings is that you have to be thoughtful what you apply tilt shift too, it only really works on some images. Below you will see some of the ones I have done.