I haven't found anything that my chickens don't go crazy for... I like to hang ears of sweet corn (tie some jute around the husk, that I peel back and leave attached) in the run when I put them in for the evening. It gives them something to do and they clean those cobs off spectacularly! I hang several of them around so everyone get a turn pecking at them. It looks like they're swatting at a pinata, ole!