I've heard great things about https://www.twitter.com/flyingpigeonla for transport riding. Plus they're a https://www.twitter.com/bromptonbicycle shop. Nothing hipper.
Bike shop recommendations? Greetings from Illinois! My sister lives in Silverlake and works in the fashion industry. She bought a used cruiser bike about a year ago but she's barely ridden it at all because she doesn't have a helmet. I'm hoping to be an awesome brother and get her a gift certificate for a helmet from a bike shop in her area. The shop has to be friendly to super-casual riders, but most importantly for my sister, they have to have "cute" helmets. Any suggestions?