Check out Sherwin Williams strips 34, 36, and 37. Also the gray strips letters K and L. Those might be good starting places.

You might also want to post your question on the Home Decorating forum for more ideas.

Good luck.

Take a look at BM Stonington Gray. I don't personally have it in my house to show any pics but did try a sample when I was looking to paint my living room (ended up going with the darker one on the strip) and on my walls it was a light silvery blue. If you google it you can find a good selection of pics and see if that is similar to what you are looking for. Good luck in your search!

Here's some gray choices, complete with pics. The first of the series is a blue gray. The names are down further in the article - and the comments suggest other tried and true grays.

Here is a link that might be useful: Best Greys

I just painted my kitchen "sidewalk gray" benjamin moore. It has blue undertones, but looks gray also. Its a little more blue than I thought, but very pretty. I used their regal pearl and am really pleased.