It's tough to say as given the light in a room it can go blue or it can go green. Krypton is a lovely blue gray yet hard to say in the space and how much light. Is the green blue plate an example of what you are seeking? Best to do is go to Benjamin Moore and get several colors you like from their sample books (large pieces so you can see they are about 6x6 or better in size) and tape them up and see what they look like throughout the day as light changes and so on as the color will change too. Below is a pretty blue with a tad gray and below that the second color is a pretty blue gray.

Warmer would be a blue/green/gray. Here are 2 nice ones by Sherwin Williams- austere gray 6184 or comfort gray 6205. Good luck! :)