Mesh food covers become play tents for action figures
Last summer, I picked up several mesh food covers (the kind used for protecting picnic food from insects) at the Dollar Store. Turns out they make great play tents for when the kids want to play "camping" with their Little People, plastic figurines and goodness knows what else! Just pop it open and cut a slit in one of the sides and then use a little tape to tape the "wings" of the "door" back!
Related (sort of): Play tent helps kids get to sleep in unfamiliar places