Cool blue Backgrounds for girls are for example: flowers, pets, animals, sunny beaches, boys, actors, the wallpaper of a movie etc. Some people just don`t want to have something in the background and leave it empty, chose only a certain colour like blue or black. Boys usually have cool blue backgrounds that include custom made expensive cars, pictures of engines, football fans have the emblem of their favorite team and so on. cool blue backgrounds are also the pictures we take of ourselves. Many girls and even guys put as a background their best picture. When going to someone`s home, the first thing we see is the desktop background, so it definitely means something.