Why hiding it?! You would like to hide the awful 90's models 😛 But now a days the TV's designs are beautiful. Besides, I am not sure, but I think that you can even show your own pictures now. You can have a real nice digital photo frame. Or why not download or design some nice landscapes and have a digital window 🙂 Why concealing it?
Personally, I prefer to leave it in view so it can be used easily when it is needed. However, I don't like it over the mantel or in any place that makes it the focal point of the room. Let's face it; most of us watch tv sometime, so it should be convenient. But not "in your face." (And over th mantel, besides being ugly, puts a crick in one's neck.)