All of these fabrics were off white to begin with. I decided to try some tea dyeing. Using two generic tea bags, in a two cup measure I made one cup of tea as strong as possible. Then I jammed all the fabric pieces in it and left it for several hours before rinsing.
I'm not sure where the gray comes from, but it is always interesting to see the surprises that happen. Since the fabrics were scraps, I can't be sure of the fiber content, but I thought the gray one was silk. I love to experiment.