Nothing as there is too much going on already.

Move the TV so it's not a neck breaking height then put a few simple items there.

Have you considered staining or painting the surround so it matches better with the stone?

Nothing -- the TV says it all!

I have the TV up high so it will counteract all those minutes spent looking down at my phone :P

Thanks for all the suggestions; I'll leave the mantle decor free for now.

As for staining it to blend in with the stone, can you do that? It's a white stone mantle. I wasn't aware of being able to stain stone?

Put a tall plant on the floor on the left side of the fireplace....left side as you are facing fireplace...looks like it would get plenty of light. Nothing on the mantle. A question....is the white part of your fireplace (surround) removable? In other words was it put on after the fireplace was finished? I like the look of your fireplace with out the surround but I am not sure if you can stain it....maybe so...but you could paint it a darker color.

If it is cast stone you can stain it but I've seen some examples on youtube and most of them don't look great. It can look really streaky.

The other thing you could do is add more light stones to the chimney so it ties in better with the mantle. This will sound weird but stick with me for a minute. Get some parchment colored pieces of paper and cut a bunch the same the size as your individual stones. Randomly tape some on the stone. Then you can see if adding some more white to the chimney part makes the mantle and chimney look more cohesive. If you like the look, just paint some of the bricks the same color as the mantle.

I would also consider pulling the whole mantle off as mentioned above. It may be easier than you think.

The white mantle isn't removable.

The homebuilder built drywall around it and I added the stone after.

Looks like I may be in the minority but I genuinely like the white mantle contrast against the stone.

It's fine to have things in the room that contrast but the decor should give the eye some visual cues to tie everything together. You may have visual cues in the rest of the room and you can just ignore me :) Perhaps a cream sofa with a rustic painting above or a rug with cream and natural stone colors.

When I look at your fireplace photo my eye jumps to the white mantle and then jumps to the tv and then jumps to the stone. The most pleasing decor has some flow, not just a bunch of cool but disparate parts.

Just in case you wanted to see the mantel painted or stained in a color blending with some of your stones:

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