I've noticed that as of late, there is an ever-increasing trend for Women to colour their hair with either streaks or large quantities of colourists dyes - specifically red and/or pink.
I've got to say, I absolutely love it and having seen more then a few gals around Vancouver with their hair in this fashion, it never fails to arouse me. There's something SO sexy about it; perhaps though, that's the rebellious side of this extremely conservative guy talking. Sorry for that physiological rubbish...
I haven't got any pictures of the girls I've personally seen, so as a result I'll have to use a few celebrities to prove my point.
Avril Lavigne:

I think Avril makes a strong case. I very much like what she's done with her hair here; not a whole lot colouring, but it most definitely looks cool.
Kate Beckinsale:

Thankfully, even my favourite celebrity has done this... Mind you, like Kate Winslet, this colouring was required for a film that she stared in. I'm not entirely sure Kate would have dyed it unless she had to. Nevertheless, does it not look great? I'll answer that; yes, yes it does!