What color should I paint a girl's room that has pink and green bedding?

Take a piece of the bedding to your local paint store and match paint chips to the colors in the bedding. Then, take home chips of your top choices to see how the color will look in the room. (The lighting in the room and the lighting at the store will be different, so it's always a good idea to look at a color sample while you're in the room the paint is for.) A lot of home centers and paint stores sell sample jars of paint so you can test out colors.