Stick to side-swept styles to make sure your hair doesn't look like you forgot to pull out your pin. All three women's bobbies were actually serving a purpose, too, and a wayward pin almost always looks like a mistake. As for colours, let the style dictate which ones you choose. Similar hues to your hair colour look classic, like Emily's pinned-back style. For a punchier take on things, try Katharine McPhee's colourful trio. Either way, you'll have a hair accessory that wins in both utility and chicness. And what's better than that?