She's Like A Rainbow

Rainbow hair: hate it or love it, it's not just for emo kids anymore.

Seen on the runway a lot last spring in a light, wispy sort of way..

Giles

Proenza Schouler

Comme des Garcon

This spring, coloured hair came in with full-vibrancy force

Jeremy Scott

Meadham Kirchhoff

Topshop

now going mainstream on the street

Charlotte Free <3 

I personally favour the bleach blonde version with hints of pink, blue, or purple, maybe even so you have to look twice to see if you were just imagining it.
I first saw this look in Nylon about a year ago, and have not been able to get it out of my head since.

more

Vanessa Traina

we can now all be jealous of Tavi (like we usually are) for picking up on this trend in a fabulous way before anyone else..

2010

2011 (this is a wig..good idea)

And it seems if you actually want this done right you don't want your hair looking frizzy and crispy, you have to go to Bleach salon, which will require a trip to London. (and yes, thankfully temporary options are availiable)