It's easy to find playthings for chickens. They like to peck at or scratch in a bale of hay or straw. Building roosts is easy with wood sawhorses or planks, just make sure everything is smooth as possible, and chickens do like a broader perch, not like a cage bird. Our chicks have a piece of drain tile to run through in their tractor, and crates stacked and secured to make a condo for them to jump up on. Apple or cabbage or cob of corn secured with a string makes fun to watch chicken volleyball. I know someone locally who makes chicken "bunkers" (shelters from sun and predators) out of old Christmas trees, stumps, shrubs, and the like.