Have you ever tried natural dyeing? I haven't but Vanessa from pidge pidge has and she shared her adventures with dyeing using Marigolds here.
Vanessa also has future posts planned for avocado, onions, goldenrod and hibiscus! If this is something that you would like to learn more about you can view the post here and sign up to get the full series via Vanessa's free newsletter. Thanks for sharing Vanessa!