I've recently become a proud chicken keeper to 4 ex-battery hens. I know we're not meant to give them kitchen scraps (not sure why not though?!), but I have occasionally been giving them eg 1/2 a broccoli, a handful of fresh spinach, some carrot peelings, with varying success. They're still mostly on mash.
I've also given them some of our garden marrow, and some apples. It seems they enjoy them more as toys than food though. Grapes, strawberries and plums have just been trodden on and thrown around. Bread roll was totally ignored.
The sweetcorn and the sunflower head have been big hits though!
What do your chickens like?