A freestanding looking glass in the boudoir is a little luxury not everyone wants to splurge on. Luckily a door-mounted mirror works just as well. Secure a basic mirror to the back of a closet door with a roll of $4 mirror tape. Builder-grade mirrors go for as little as $6, or you can opt for a more elegant vanity mirror to bring a bit of beauty to your space. Cost: $10-15.