This will be difficult. Your color comes up very gray, no hint of olive. I'm not a fan of accent walls.

Perhaps a lighter gray, matched more to the new tiles?

If I paint the mantel the same olive gray, will that bring out the tiles more?

I do think olive gray is nice by itself, but maynot go well with our carrara marble tiles. What is a better choice of gray for this? Secondly, the kitchen and the remaining walls of this room are yet to be painted. Do you have a suggestion on what combination will be better? Thanks.

I think the remaining wall color is too yellow for the white mantel and tile.

palimpsest, do you mean Olive gray is too yellow and pale?

will painting the mantel gray look better?

I'm not a fan of accent walls, but that's just a matter of personal taste. I think what's jumping out most is the glossy sheen of the accent paint. If you switched to a flat or eggshell, the color might work fine with your tile. It also appears gray (not olive) on my monitor, which seems like it would work with carrara marble.

It sounds like you're planning to paint the rest of the (currently ivory) walls. I'd probably go with the white of the mantel and cabinets (swiss coffee) for a less busy look, or if you decide to ditch the accent wall, a pale gray on all the walls would probably look nice with tile. I don't think painting the mantel gray would look better.

Another thing that might look nice is to wrap the top of your mantel with a crown molding similar to what you've got on the top of your cabinets (so the top of the crown is flush with the top of the existing mantel). Also, you could paint the gold strips on your fireplace with a matte black.

The mantel and the wall color are off. It's hard to match whites. And the brass accents are also throwing things off.

The tile looks great! I agree with palimpsest that the ivory on the other walls has a yellow undertone that doesn’t relate well to the cool tones on the accent wall, mantle, and tiles.

I don’t think I would use paint to create an accent wall here. One color throughout the space would give a clean cohesive canvas for artwork and decor.

What about putting the darker color (not as dark as you have on the wall, more of a light or medium shade) on the mantle to highlight the fireplace?

I don't have time to play with the wall and mantel colors but here is a quick pic of the fireplace with the brass accents painted.

On my monitor, the wall color looks warm and the gray in the tile looks cool. I think I’d paint the whole room a true light gray

I think her kitchen cabinets look warm as well and that opens to the family room. I wonder if a lighting change would help. Accessible beige plays nice with warm and cool.

Yes the family room flows into the kitchen. I do plan to paint the golden trim of fireplace to black. At a later point perhaps add some white candles inside the fireplace for decorative accent.

What shade of gray will go, if I decide to give up the accent wall and paint all the walls the same?

I am using Kelly Moore for the rest of the house. (Olive gray is Valspar. It is semi gloss because kitchen is going to be semi gloss too)

I would definitely use eggshell or satin. Semigloss is hard to use when you want a certain color. Plus, it shows all imperfections.

Sorry I'm not familiar with Kelly Moore colors, but I'd try something like Alaskan Husky from Benjamin Moore. It's a cool pale gray. In eggshell. And no accent wall. While I'm at it, I'd like a crisp white trim color.

Another very popular gray to try is BM Gray Owl. Another is BM Stonington Gray. You need to paint sample boards and see how colors reflect the light in your home. Look at them during all parts of the day and night. Sometimes you love a color in the day and not so much at night.

Others transition nicely.

No, the light ivory wall color is yellow and the mantel and marble are not.

So the original was ivory. I am painting the whole house. Ceiling will be swiss coffee as the doors n trim. I have to paint over the ivory in the kitchen too. Olive gray looked nice as a color swab but in the room not so sure.

Can I still do dark brown floor with light gray walls? (No accent wall)

You'll just have to watch the undertone of your stain. Some browns look a little red or orange. Bring home the sample board and see how it looks with your paint. I would also look at medium tone stains, unfortunately very dark brown floors are falling out of favor because they show every spec of dust.