I never saw any such thing in Vue, uncle808us... But you can download a free, small utility called Absolute Color Picker. (Windows only, but there is no mention of it being compatible with Vista)... AnyHOO, it uses little resources, so you need not worry about opening it when Vue-ing. ;)

I've been using it for some time, and I must say the screenshots link doesn't do the utility justice. You can choose many viewing modes like these (there are more):

   

After clicking in the little box with text in it and holding down your mouse, you can drag your mouse anywhere on your screen to get the color codes. It works for anything you see on your desktop, including the desktop itself. :p