eg. We took a graffiti piece and made it look as if it was part of the wall, even though it is a seperate image. The graffiti takes on and molds itself around the bricks and their indents.
Another tutorial done was creating the effect of using a Tilt Shift Lens on an image in photoshop. The overall effect is one that makes an image look as if it is a miniture scale model of a building, people, cars, etc.