This room below, our family room, (along with the full first floor) will be painted Stonington Gray with white trim and ceilings. Not pictured here, blue slate was just installed as counter tops on the built in and the mantle. Also missing from the room photo, the fireplace is currently being finished with Alaska Gray stacked stone from Home Depot (stock image below).

Here’s my dilemma. The stacked stone has blue undertones while the blue slate is pulling slightly more green causing a slight mismatch up close. The stonington gray will complement both however I would like to tie it all together by painting the two walls behind the built ins an accent color; ideally a few shades darker gray than the Stonington. Any suggestions? Is Timber Wolf the best match to use for accent?