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Hi
Looking for help please. we were going to have the white/gray quartz that is at the bottom of the kitchen wall extend up all the way to the ceiling but the contractor is not been able to find quartz slab that matches as well. We have decided to go with a wooden slat instead. Trying to decide if the slat should be dark brown to match the floor or black.The kitchen cabinets are black, there is a black fireplace wall in the living room that is connected to this area,, and there's a sunroom adjoining this room, which has the same kind of wooden slats behind the TV wall.

First pic: where we need to put the slat
Second pic: fireplace wall
Third pic: the dark brown floor
Fourth pic: wooden slat sample.