Well, they love anything to peck at. You can hang a whole cabbage and they will enjoy pecking and eating that. Also, I had corn in my garden, and some of the ears were buggy. I gave them the fresh corn and they LOVED it! Also a flock block. I have one in my coop and they're slowly chipping away at it.
Love the different ideas,my girls can really get irritated with each other in the winter.tried a mirror but they are not interested. They did like romaine stuffed into a suet holder though.