C+P: "Un-Color" PC

I used to have a dress that was sort of khaki, sort of grey: I called it "the un-color." These days I have a car that is sort of silver, sort of green: it's the un-color, too. The un-color is whatever you think of as not really being a color. I'm not going to post a picture for this one, because I don't want to suggest a particular color. You may think of beige as an un-color. Or gray-green. Or brown. Whatever—it's entirely up to you.

So your task is to make a monochrome postcard in some color you think of as the un-color. You can't choose black & white, because that's not monochrome. (But you can choose monochrome black or monochrome white.) As usual for our monochrome swaps, the whole PC doesn't have to be the un-color—just a large proportion of it. Also as usual, it's sender's choice, and you should use collage as your primary medium, although you're allowed to add paint, rubber stamps, etc., if you wish.

Have fun, y'all!