I had the idea to put a flat-screen with the brightness cranked all the way up behind a sheet of one-way glass in the bathroom. The mirrored glass would serve as the vanity, but the display would come through in the right lighting conditions. I planned to frame the glass and put bathroom caulking behind the frame, surrounding it so no moisture could get behind and into the wall where the screen would be housed.
The added benefit would be that you could watch the news/traffic/weather while you shave in the morning since it would probably be possible to not only see the television but shift your attention to the reflection in front of the screen as well.
Never got around to it since it was low on the list of things to do and a relatively expensive project in ratio to necessity. If you choose to explore this option, I would do a test with a piece of the reflective glass you plan on using. Most of the stuff I've seen is tinted so you would have to make sure the screen would be bright enough to compensate.
Good luck.
edit: spelling
