We finally got to MY color choices in the year-long postcard exchange in which I'm participating, and I really did enjoy working with these colors.
I started with copper shim, and watched it change color over the flame of a candle. Then I embossed it with a stylus, and put it on a background of fabric and leaves cut from my handmade papers, with a couple of old postage stamps added for interest. I stitched all over the background with metallic thread, and right through the copper with red thread, and finished it off with copper tape around the edges. Pretty cool!