Mirror, mirror on the wall...I don't like you very much at all. If you're putting up with the mirror you've got simply because it's not a very high priority (and you've got to look somewhere to make sure you don't have toothpaste on your face in the morning), it's time to trade it in. It might be valuable, especially if it's an older Venetian-style piece. These are typically rectangular glass plates framed by smaller glass panels that are sometimes etched. Michael Capo says they were manufactured widely in the United States in the early 20th century but are now hard to come by. Depending upon such a mirror's condition, it can be worth $400 or more.