Let me know where you get the good edible kind of nasturtiums - I understand humans can eat it too except I researched that it is spicy/bitter? Nasturtiums planted between rows of garden vegetables is supposedly a good garden insect deterrent as well.
I understand pansies are chicken edible but they are only an annual and too expensive to keep buying and replenishing pansy plants every year.
I found that although Marigolds are good for insect control in your vegetable garden, there's only ONE Marigold variety that is the beneficial one as an insect deterrent.
My chicken friend planted corn and grains in a little area on the side of her coop but I personally don't want to attract rodents, rats, mice etc. so near to my coop - something else to think about before planting attractive meals for predators.
A plant my chickens loved was an old climbing rose bush to sit beside for hiding and shade during the day. The roses looked pretty, smelled nice, the chickens loved the shade, and rodents don't like the thorny branches. A row of different colored rose bushes in front of the pen will look nice and the chickens will love the hiding and shade they provide but it will obstruct your distant view of the chickens. You decide whether you wish to shade the chickens or enjoy the view of their pen from a distance - be aware that chickens usually don't stay out in open view for long anyway. Ours are always sitting under bushes, lean-to's or inside their coop when not actively foraging. Sometimes they sit up against the green trash bin in the backyard to hide/snooze. They don't like open spaces so having an open view of their pen from a distance could be a moot point - meanwhile the decorative yet shady rose bushes would be used by them. One other thing I like about the rose plants is that they are so darn hardy and don't require constant care - a little rose fertilizer a couple times a year and pruning down the stems in November and they grow back big and beautiful by Spring. My climbing rose bush was 25 years old before we finally had to pull it out during remodeling and we never fertilized it OR pruned it! The only flower plant I know that can take neglect and abuse and still come back fresh and beautiful in the Spring!
If you want a good reference book preview it at a Barnes and Noble bookstore - it is called [COLOR=008080]"Free-Range Chicken Gardens"[/COLOR] by Jessi Bloom which lists toxic vs safe plants to have around chickens with attractive garden photos, coop designs, and backyard layout plans. It's $19.95 in paperback and less $$$ if you download it to a Nook. I just picked up my book last week after drooling over it for the past 6 months. This is one of two basic reference books I have on chickens and the other book I have is [COLOR=008080]"Storey's Guide to Raising Chickens"[/COLOR] 3rd Edition.
You really turned the chicken run into an attractive backyard scene!