get some blue under pad (for sleeping bags) to wrap a shoe or old sneaker (try to use a pair with black bottoms/soles). Note: make sure you use a pair of shoes that can be put on and off quickly (like slippers). You may also need to leave a flap in the top front with velcro to allow opening and closing around your ankles (helps to keep them on your feet. Make sure you leave room at the bottom of the foam to allow for the sole of the shoe to contact the ground.
ACEO Whimsical Christmas Trees I painted in pen and ink and watercolor