Charcoal Making
Joshua Ralph is an illustrator and eco-artist that has been working with invasive plants to make charcoal. He hosts workshops making pencils out of blackberry and black locust twigs. He's detailed how to make them on his website.
Caitlyn Ffrench is a textile and pigment artist that makes ink out of earth materials. She's used blackberry canes to make charcoal, which you can watch here.