I don't know how many others are aware of this newly discovered item, but I found them invaluable when doing a room makeover. They are wall plug covers, which screw directly as a new faceplate, and eliminate the headache of cutting wires and changing outlets in order to change the color, which is usually the outdated ivory color.
It takes one screw, cleans up the outdated plug, makes them easy to wash and clean, and are slightly oversized to cover the old paint lines. They can be found at Home Depot, and cost $2.25 a piece.
Below are a few pictures which describe their uses a little better.