I've kept my hair brown with white Rogue bangs for about *counts* six years now. It gets really hard to keep my bangs white when they want to naturally bleach to a sickly yellow but if I dye them a silver or lilac then they fade to white pretty quickly.
But that's just my bangs - the rest of my hair is it's natural brown. I went through a phase of dying it black and dark brown but I've let it go granola for about three years now. I just fool around with my bangs now... (which I've tried in vain to make electric green but it never works.)