A Different Stripe
Whether you want to camouflage grays temporarily or just try some highlights, Alterna Stylist 1 Night Highlights is your stylist in a can. Press the button near the base of the brush to dispense a moderate amount of colored mousse, which you brush onto your hair. It comes out with your next shampoo. In blond, caramel, red, and pink.
To buy: $29, alterna.com for stores.