These two photos have similar elements to your room, They both have very pale beige/gray tones -though slightly warmer than Agreeable Gray. One has the same color on both fireplace and walls, but I like the second example for your room. It may be an optical illusion, but the fireplace appears to be darker than the walls. I like the effect. In your case, I would consider the opposite - walls darker than the fireplace. If you were to extend the fireplace color a few inches on both sides, it helps to balance the visual size of the fireplace with the large TV screen. I hope this mock-up helps you visualize the idea.

It looks cozy with your couch and it doesn't need to blend with the fireplace like FF said

I like the idea! What color you think would be good for the whole room though?

Collanade/ accessible beige / wordly?

Agreeable look bluish. You can see it in the picture.

I copied this info from kylieminteriors.ca. I think you’re going to have try samples in your own lighting, though.

Here’s a few more to consider.