The new drywall on the focal wall could be painted black - kind of your original idea on the concrete
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You could do simple painted wood paneling (board and batten) - similar in style to the doors - on the focal wall - work around the TV size.
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Find a tumbled gray brick like this?
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Like this color and technique for concrete floor
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Like the accent wall color
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Concrete floor color
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Like this color of stained concrete floor with the wood wall.
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Idea of Vahallan Paper on the wall - it is handmade paper in Lincoln and comes in lots of different patterns and colors - gives a modern feel
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Also Vahallan Paper - it runs about $6.00/sf installed depending on the pattern. It would be a warm finish and also gives a modern element. I like the mix of rustic and modern.
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Just do drywall - paint a nice accent color.
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This blue would be a nice accent color.
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Soelberg has laser cut wall panels - here is is shown as art -
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This is also Soelberg - 3D wall panels - would need to check price on this. Comes in lots of patterns and colors.
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Here is a wood/brick combination with a TV - not sure what that think below the TV is but interesting look. The brick could be more gray?
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What about this style of wine rack incorporated into the cabinetry?
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Use wood on the focal wall and then some kind of cabinetry with the TV above - would be additional storage.
The new drywall on the focal wall could be painted black - kind of your original idea on the concrete
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