If you have no time to wash and style your hair, you can pump up the look with three basic ingredients: a round brush, a blow dryer, and a volumizing product, like Luxurious Volume Lavish Lift Root Booster ($6) or Oscar Blandi Volumizing Spray ($18). First, hold the hair straight up on dry hair and spray the roots. Next, take a small section from right behind the fringe, wrap it around the round brush, and blow-dry, concentrating on lifting the roots for volume. Finish off by grabbing subsequent sections of hair back toward the crown, and there you go. It's instant volume without too much effort.