Grey has always seemed to me a grey with a bit of blue, like dark rain clouds. To me, it's soothing, cool, and refreshing. Warm gray is gray with a bit of pink added, or yellow. Not so you can visibly see the pink or yellow, maybe a tiny bit of beige added. An irritating warm gray, which always puts me at odds.
Colors are interesting and definitely affect emotions and states of mind.
For istance, orange in sunset clouds or flowers I like fine; orange clothes or in signs - Ouch!
Why do we think this, though? What made us associate the English spelling with bluish, and the American spelling with pinkish or lighter? Is it because old grey had blue in it, and we associated it with older, English (Old World) things, while modern things are lighter and brighter (more "American")?