Grey would be nice, but may be too dark with the navy sofa. I recommend going with a lighter grey, and adjust your lighting to lessen the yellow and brighten things up a bit. I hope this was helpful!

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Are you wanting a recommendation for a color? I think gray would be nice in this room.

The color of gray depends on the light in the area where you live. My favorite color, Glidden Wood Smoke, looks different in Seattle than it looks in Colorado.

When you're looking for a paint color, especially a gray, try to find a good balance between a warm and a cool tone. Look for something a little more tan than it is green or blue, and this will keep you in a neutral palette. Make sure you test the color in a large swatch on your wall before you make the decision. Look at it in the morning, afternoon, and night, and remember that it will look a little different on its own than when bordered by the yellow color in your picture.

This project we did recently has a great wall color you might like with your blue furniture.