Aberdeen is gray, literally, buildings, pavement, sea, sky are all grey! against all probability at the moment even the light is greyish. It is a very depressing place.
Edinburgh is usually pinkish in the summer,(all the luvvies congregating here for the festivl) but is blue in the winter (blue is the colour of the civic christmas decorations!)
I always feel that glasgow it the colour of Burberry tartan liberally stained with blood.