I think Helen was on the right track when she suggested that colors took their names from nature. [thanks] WW, I have occasionally heard simply the word lemon used, or sometimes, "lemon-colored".
Speaking of cultural references, Alex, the sagebrush plant that grows out west is a grayish-green. So much so that I would not call it a true green.
I have to say, I take utter delight in the room I am sitting in. I wanted an "under water" look; the walls are a light mix of blue and green, and the carpet is a dark shade of the same. Neither is truly blue nor truly green, which fascinates me, besides the fact that to me they are beautiful. The carpet-store lady said there wasn't another shade like this one in the whole store. A white ceiling adds a welcome and placement-appropriate lightening effect, plus white curtains that I tell myself look billowy...