Ever wonder why there are two ways to spell gray/grey? It's simple really, grey is the original English spelling, and gray is the Americanized version. Many words got jumbled letters as they traveled/travelled across the bumpy and wavy Atlantic.
So, I guess you could say that
Gray is a color
while
Grey is a colour
Although I am aware that neither of these is really a color/colour, as they lack any chromatic component.
I have always liked the English version better, grey seems to me much more greyish than gray does. More dusty and ancient. Grey Poupon, Gandalf the Grey, Earl Grey, Grey's Anatomy...all the classic greys are grey and not gray.
