Use some of our bath tile! Tutorial by Centsational Girl: mosaic tile bathroom mirror (paint color is Glidden Oyster Bay, tile is a custom mosaic blend from Oceanside Glass Tile in white, clear, oxygen and moonstone)
Revamp Bathroom Mirror: Before & After -- And it doesn't involve cutting or removing the mirror! Not that I have a mirror in the house larger than a Or a bathroom that large. My bathroom is about as large as that mirror I think.