Mushroom Cloud by Chris Drury is made from real mushrooms.
Drury on his work:
I have a continuing fascination with mushrooms and their spore prints, and this interest has informed much of my work over the last few decades. Mushrooms can feed you, kill you or cure you. They are nature’s great recyclers, breaking down dead, organic matter back into the soil in which plants grow, and thus metaphorically they represent the ongoing cycle of life, death and renewal.