I have a tv mounted vertically in my home theater and use it to display movie posters using a program called movie poster app. Changes the poster every 3 minutes or so. Also displays the motion posters you sometimes see in fancy movie theaters.
I also have it synced up so when I start a movie on my projector it switches to the poster for that movie and says now playing. Then it dims slightly so it doesn't fuck up the lighting in the room. Pretty cool shit.