Paint the walls of a teen boy's room based on the colors of his favorite football team. If his favorite team is the Dallas Cowboys, for example, use blue and white paint to decorate his room. Opt for blue on most of the walls with a white stripe through the center of each wall horizontally or several white stripes running vertically through the blue.
Ask your son what his high school colors are, especially If he's on his high school's football team. If the colors are gold and black, for example, make stripes on the walls by alternating colors all the way around the room. Another option is to paint most of the room gold and then have one accent wall another color, such as black.
If you're artistic, paint a mural on a teenage boy's wall depicting a football field or football players playing football. Hire a local artist to paint the mural. Alternatively, paint footballs on the walls or one very large football over his bed. Another option is to paint a goal post on the wall over his bed.