Forced perspective photography
You don’t always have to use Photoshop to create optical illusions in your photographs. With a technique called forced perspective you can create illusions that make an object appear farther away, closer, larger or smaller than it actually is. It just takes a little creativity with the placement of the subjects in the shot and the camera angle.
To give you some inspiration, here are some creative examples of Forced Perspective Photography.
Via Instant Shift