It almost seems too good to be true, but there is now such a thing as hair mascara, and it really does work. Widely available in most large drugstores (and at Christian Dior counters at department stores, which sell a high-end version), hair mascara comes in all the basic shades and can cover strands of gray or pump up blonde, brunette, black or red locks. Follow the color coding on the box to select the tone that best matches your hair, and then brush it in where it's most needed. You can also use it to create highlights. Although it shampoos out easily, hair mascara holds well and won't stain your clothes.