The picture is too dark for me to even guess...but it looks like a greyed down blue or a grey with alot of blue. You might try posting this over on Home Decorating and see what those clever folks come up with. Good luck.

On my monitor it makes me think of Balboa Mist BM but there are so many creamy gray beiges that it could possibly be. I would love to know! Some others I love... Pale Oak BM, White Sand BM, Collingwood BM Keep in mind lighting can totally effect a color. Revere Pewter is one of those amazing gray paints that can look a creamy beige in one light and a stark light gray in another.

If the pic is from Pottery Barn, they have partnered with Sherwin Williams. You might look at their website for the Pottery Barn colors. My guess is it’s Alabaster.

What a cool project! Have you considered wallpaper? I think a fun pattern could take the room to the next level — and tie all the ideas together. Not necessarily these, but just to show examples (obviously the patterns aren’t to scale and would not be so large): London Art Deco Jungle https://www.manomano.co.uk/p/art-deco-leaf-wallpaper-rasch-retro-green-cream-paste-the-wall-vinyl-floral-27565318 https://www.hovia.com/products/green-art-deco-crane-pattern-wallpaper-r/