Many fungi, which we call dye fungi, can be used to dye fabrics or yarn. Examples include the Blue Pinkgill mushroom(New Zealand), which gives a blue shade, or the Surprise Webcap mushroom, which yields a red hue, depending on pre and post-treatment of the textile or yarn.
Sources
Natur & Kultur – Unusual Edible Mushrooms by Oliver Karlöf 
Atlasobscura – Get to Know New Zealand’s Hugely Popular, Thrillingly Blue Mushroom
Treehugger – 11 Colorful Mushrooms and Other Fabulous Fungi
April 2023, TÄNKOM | Revised February 2024 RETHINK
