One of the easiest ways to update the look in your room is to update the light switches. It's usually the first thing you reach for when you walk into a room, so a new switch plate will surely get noticed.
Find a decorative switch plate that will fit the design of the rest of your room. Replace a plastic plate with one of brass, copper or chrome for a more refined and decorative look. There are even switch plates that have textured designs or have pretty color schemes.
Using a screwdriver, unscrew the old plate, then simply screw in the new plate into the same holes in the switch.