Love the idea of creating a super hero inspired room. Here's a tutorial and printables for recreate these super hero bins via Sugar Tot Designs sugartotdesigns. You could also put monster pics on the totes for a monster room
"storage ideas - stuffed animal zoo" I had a giant hanging hammock above my bed that held all my stuffed animals when I was a kid. But the whole idea of building a little cage and calling it "The Zoo" to hold animals is adorable.