Thank you for the compliment. I'll pass it on to the girls. They are a mixed flock of Speckled Sussex and Silver-laced Wyandottes, pictured here with a couple of my Ameraucanas, or Easter-eggers. I also have two kinds of Brahmas and a Cochin.
The floor of the run is sand. I can't recommend it highly enough. It's easy to keep clean with a cat litter scooper, and the hens as well as the rooster all love to dirt bathe in it. On hot days I wet the sand down, and the evaporation cools the air down a good ten degrees, and the chickens love to hunker down in the cool wetness.