These guys were fun to do.
I took a batik fabric, and ironed on freezer paper mushrooms. I applied Presist around the freezer paper, and then removed the freezer paper when it was dry. Then I used bleach thickened with alginate to discharge the mushroom shapes. After the bleach I used a peroxide solution to neutralize it. Finally I used oil pastels to subtly shade them, and ironed to set.