Don’t just shoot from a standing position. Get down into a crouch and shoot low—or get up on a chair and shoot down. Vary your angles. The LCD screen on a digital camera makes it easy—you don’t press your eye to the camera to compose a shot.
Changing your angle can be a great way to remove a cluttered background. When photographing flowers, for example, I like to position the camera low and aim it upwards, so that the flowers are shot against the sky.