I add "furniture" to my roofed enclosed run....a old plastic Adirondack chair....hollow stump laying on its side...perches made from scrap lumber and branches...a half barrel cut length wise and dog house door shaped openings on either end...they have their own wind chime...set so they can peck at it if they wish...a mirror fascinated them for quite a while...till they figured out it wasn't a real bird in there....i made "Weed Feeders" out of a wood frame and hardware cloth, stuff it full of fresh cut or pulled weeds, they happily pick away at it eating the yummy weeds...I change things around...add new ones and remove old ones...I stood a bushy spruce tree in there last winter...they loved to hunker down under it....I figure if I was stuck in there I'd appreciate something to make it more interesting....and giving them a changing environment helps to get them used to new things...they are less likely to panic when confronted with unfamiliar things...mine usually react with curiosity....I had trouble getting the tree into the run and standing it up....all the chickens crowded around to check out this new "Thing"...use your imagination and their little world will be richer because of it.