Lots of big, gigantic existence of epic proportions are blue. For example, the ocean. The sky. Blue is a color that is often used to symbolize something deep, dark and mystical. And blue is also a color used to give people an impression that something is cool and subtle.
If you add film at the back, it would mean something that millions of people like. Blue + film = blue film. You know what I mean. Haha. So it is safe to say that blue is a very popular color. All shades of blue. I used to like blue but now I am into other colors. It did not bring me much luck... Heh.