Including the colour outside the primary content area wouldn't be very accurate, since this is dependent on the viewer's screen resolution. For example, viewing Facebook on a widescreen display yields significantly more white than on a non-widescreen display.
I'm keeping white/black and greytones out for now. White/light greys are especially hard... how would you differentiate between the content and the background?
Is it ignore background-colors? Firefox is primarily green on this but of course the large button is there but the overall theme of the site seems to be that shade of blue
