I have Revere Pewter in a bathroom and it has a brownish-green undertone.
BM Stonington Gray would be pretty in a bedroom. SW Collonade Gray is similar but with a brown undertone. SW Tinsmith is bluer.
Check out this link and scroll down - she separates out grays by their undertone:
http://mariakillam.com/downloads/marias-bonus-book-of-colours.pdf