Phone booths aren't entirely necessary these days thanks to our handy cell phones. However, they drive revenue for cities thanks to advertising. Bloomberg is challenging New Yorkers to help redesign the phone booths. Let's get in on this. If you are a New Yorker, submit something: http://www.reinventpayphones.splashthat.com/. For now, let's throw around some ideas: How can we turn phone booths into something cool for our cities?