Wall Art For Music Room

Over the years I have done a number of acoustic treatments on the walls in my 2-channel listening room, but I still have a large screen plasma TV hanging on the front wall of the room (between my speakers). I keep the television screen covered with a moving blanket, but I wonder how much absorption this blanket provides.

I would love to hear input from others on this forum:

1. Does the blanket provide any significant absorption from the sound coming off the rear of my Martin Logan speakers?
2. Does anyone have a recommendation for acoustic wall art that passes the Wife Acceptance Factor test, while still providing good absorption behind larger speakers?

The room is treated with a combination of absorption and diffraction, but this front wall could be improved.

I appreciate your help.