I'm working on improving my chicken run as well. Here's what I have for ideas.
Add lots of
wood chip mulch inoculated with some
mushroom spore.
Should help cover bare ground areas, give the chickens something else to scratch through, help prevent some of the standing water/puddle areas I have, and
compost down over time into soil. Mushroom spore should add some diversity...don't expect to get any mushroom with all the chicken scratching but you never know.
Add some cover/forage crops. In the main area I'm building some forage boxes like these
. I'm seeding them with a variety of nitrogen fixing peas and clovers, some grain/grasses, etc. I have a couple of different patches I'm going to build these in around the run. I'm also planning to
fence in a few more areas and plant forage plants so I can do a bit more rotational grazing. Last summer the chickens pretty much free-ranged all summer but with the additional gardens I'm planting, neighbor dogs with a bit too much interest in the chickens, and getting tired of chickens getting into and crapping on everything I'm thinking of keeping them a bit more contained in the future. I still want them to range and get more nutrients from bugs and greens so I want to try a rotational system.
Plant more fruiting bushes/shrubs. The chicken run area already had a variety of wild blueberry, huckleberry, and salmonberry bushes and the chickens love, love, love picking the berries off them. Unfortunately they also stripped them of all their lower leaves and possibly killed some of the smaller shrubs. I've been adding some rocks, and pieces of old lumber around some the the bushed to protect the
roots. Come spring I'm going to fence around some of the patches so the chickens can't strip them before they have a chance to flower and fruit. I'm also thinking of planting some more fruiting bushes around the fence line. I want to include some nitrogen fixers as well.
Adding rotting logs and bug boards. I'm laying around some old boards and logs throughout the enclosure. Bugs tend to congregate under the boards, where it is nice and damp and protected. Creates a safe breeding ground for the creepy crawlies. Every so often I'll go out and roll the logs to a new spot. Chickens come running to get the exposed bugs and spend hours pecking at the logs picking out bugs and their eggs.