If you've got a short, pixie cut, try using some gel or pomade for a cool chunky look. Just rub a little product onto your fingers, and define the pieces with your fingers.
Got long layers? Try some straightening balm or styling cream! Put some in the palms of your hands and work it into damp hair, especially on the ends, before blow-drying. It'll add body and shine, and work on funky curls.
Grab some mousse if you've got curly or wavy hair, and scrunch a little into damp hair. Let your hair air-dry, and avoid the brush so you don't destroy those star waves!