One of the only things that bothers me about cycling is the state of my hair afterwards. I always wear a helmet (one broken collarbone later taught me my lesson!) and it tends to end up in a frizzy-but-flat windblown mess a la Bridget Jones:

Poofy
Anyhoo, tis a a neccessary evil, but I think many girls are put off wearing a helmet because of the ugly styrofoam blocks that are sold as ‘cycle helmets’:

Bulky
Bobbin Bicycles have a great range of helmets that are an alternative to the sexy styrofoam block. Their Yakkay helmet comes with lots of different covers which transform an ordinary helmet into something you are proud to show off through the city streets:

Yakkay with Black Cap

Yakkay with Pinstripe
They also do a gorgeous rain cap for non-helmet wearers:

Rainhood