Inspired by Johnny Dangerously.  For novelty purposes only.
 
Size: 3.5 x 8.5
14 pt. Cardstock
High Gloss UV Resistant Coating
Back is plain white.
 
Why buy 5?  They can rip...especially if you're into removing and replacing this on your mirror frequently. 
 
Hint: If you have a thick mirror base with cords coming out--take a scissors and widen the inner diameter of the hole before hanging.