I just removed a row of border bricks from the chicken yard, and filled the nice long "hole" with corn and sunflower seed and some good topsoil on top.
In a few months, I should have some nice free treats for the chickens, and hopefully a little more barrier for the neighbors(they like the chickens).
I also plan to plant some mustard greens and a few squashes, the chickens can have all the leftovers and trimming from those as well, but not free access.
I think the best thing I can plant is lotsa grass seed to keep the lawn up, they really love to eat it.
I have 2 big hens freeranging now, but the 40 babies are growing quickly and learning to forage.
I plan to keep 10-12 hens on 3200sqft of lawn, I want the lawn to keep up.