This is so incredible. My friend's mom loves dying wool with natural pigments (she even gets her wool from local alpacas!) and she'll go crazy for this. She has wanted a blue/green for a while and it turns out there's one that actually grows around us.

Actually a lot of these mushrooms can be found around where I live. I'll have to go on some hunts before winter!

edit: It would be cool to see something like this for other materials like barks and leaves. As teenagers we used to go around the woods finding her all kinds of weird stuff to dye things with... usually while hunting for our own mushrooms (not for dying things)