black

Deep navy or Tuscan-like-orange

Black would be my choice , but I would also consider other colors to brighten to counteract the dark gray.

Navy would be nice.

That's the great thing about grey, the possibilities are endless. Most clean colours would look good. Not muddy, dirty colours. Trim white would be boring. This is a great opportunity to show some personality as to who lives there.

What colors are you planning on using inside your house?

I agree with Caroline. Bright blue or red.

What's your personal style?

Front Door Colors

Classic Red

Happy Bright Sunny Yellow

Artistic Gutsy Blueberry

Conservative Navy Blue

SW Really Teal

Thank you everyone so far! You have given great ideas and advice.

Lemonthyme-I attached some pics. Main wall colors are SW Sea salt (bathrooms, laundry, mudroom) and Repose Gray (everywhere else; pic included). Trim is white. Flooring is hardwood and tile (large gray one is the color I chose for tile) on first floor....mostly hardwood. No carpet downstairs, only upstairs. Cabinetry is dark stain too; countertops look like Carrera marble. I have lots of gray tones, but I chose Repose Grey because it is a pleasant warm gray. I don't want an "industrial" or cold look, on any level. So I am looking for places to add color. Thus far, I did not put much color in my interior, except for the rooms I used Sea Salt for a paint color. Even that is a very understated blue-green-gray!

Sea Salt is my primary interior color also. Love it

Butter yellow.

Teal. Like the glass jar in this sea salt bath.

How about a deep, plummy red like Framboise by Sherwin Williams?