This seems like a perfect shelf and cabinet layout based on our spacing. Could work nicely if face of fireplace were raw or white brick. Crown molding look? (not sure what to call fireplace surround) may be too formal but generally like.
This is what we want for the fireplace wall. White marble tile surround, white wood work and built-ins on either side. Living room fireplace with white marble mosaic, Sherwin Williams Ponder on walls