Hair color.

When we began collating our take on 2011′s hairstyles we wrote of the idea of just changing it as major driving force behind any 2011 hair colour choice. And behind that ideal, amongst others, was model Natasha Poly who, in late 2010, transitioned from standout blonde to more subtle brunette. Admittedly for her features it wasn’t the best of choices. Hence, here at New York’s…

We would hardly blame you for thinking this is Sienna Miller you see before you. But it is, in fact, another English Rose gone blonde. Our 2011 hair colour mantra of just change it is proving ever popular, with just one general rule: it must be a block colour. Kate Beckinsale changes it to blonde, and we think the results are more than satisfactory.

Yet another model partakes in the key 2011 hair colour trend, just change it. This time it’s the formerly mousy blonde Carmen Kass who has opted to become an all out brunette.

Could it be? Yet another 2011 hair colour change seems to be on the way – with Frida Gustavsson looking suspiciously red haired on the cover of Elle Sweden’s January 2011 issue.

A moment of inspiration for a 2011 hair colour trend, white blonde hair, in the guise of New Zealand model Phoebe Farrell.

Here’s something of a two in one piece of inspiration for you, with another view of Britt Maren‘s striking hairstyle that is perfect inline with 2011′s hair trends. Her white blonde colouring grabs the eye, while the dramatic, almost pixie crop, haircut maintains the gaze.

It was something I put into yesterday’s look at how to pick a hair colour from 2011′s hair trends without much fanfare, but given it is such a dramatic change for Lily Cole it seems only right to again highlight that the model recently ditched her normally red locks for something far darker. There’s another picture after the jump.

She’s become ingrained in our minds as the smoking hot blonde with the killer cheekbones – but a model’s life is all about reinvention and staying fresh. And for Natasha Poly that’s translated to a recent, dramatic hair colour change from blonde to dark brunette. Debuting the new colour in print for the first time on the cover of Vogue Paris’ November 2010 issue, Natasha…

As a reminder of just how striking the long bob as a 2011 hair trend can be, I simply couldn’t go past this shot of Abbey Lee Kershaw on the runway at Fendi SS11. The peroxide blonde, the red lips… a perfect combination.

As the fashion weeks roll on we expect to see many a variation on Abbey Lee Kershaw’s blonde hair. Spotted with her shoulder-length bob worn sleek and with a side-part, we can’t help but love both the colour and style on Abbey – and we have little doubt they’ll be on the 2011 hair trends list.