I bought this brown and black wood framed mirror at Wal-Mart.
I had a friend (Thanks John!) attach the mirror to the wall first before adding the tiles. I was concerned about the added weight of the glass tiles since the mirror was already heavy. He assured me it would hold well with "butterfly" screws. This way the screws wouldn't damage any pipes behind the wall either. I suggest attaching to the wall first because of the mirror's weight before the tiles are added. It might be almost impossible to attach afterward.
Mirrors are extremely expensive, but I made this one at a fraction of the cost!