My coop is open all day while girls free range so any toys I've tried have been greatly enjoyed by squirrels. I did think my girls needed some culture though so I hung artwork. They didn't care but coop visitors think its funny :) Here is the chicken version of sistene chapel.
Mine are super spoiled and come running whenever the back door opens. Favorites are watermelon rinds, grapes, corn (even the empty cobs we've eaten they will pick at with great gusto) and bananas. On really cold winter nights I make a warm porridge of oatmeal, corn, blueberries and anything else...
Whenever you lie in the hammock your buff orpington comes up and stands patiently until you lift her up so she can sleep on your stomach while you pet her.
Eating a popsicle outside starts a chicken free for all.
You get a collapsible playpen on craigslist in case one the girls gets sick so...