This is a good concept reference for the wall with the fireplace and bookshelves. For my taste, I would like a deeper stone color for the fireplace. Like the brush back metal look for the doors and spark screen.
I love this stacked stone fireplace. I think the brown in the stone would look pretty as our corner fireplace in the living room. Wouldn't go all the way to the ceiling, we'd stop at the mantle, but wrap from wall to wall instead of just the front wall. Looks easy to DIY.