Has anyone tried? That's one of the most popular chicken run choices! And the best all around, in my opinion, because you don't need to clean the run and it doesn't get poopy, muddy or smelly. And its the one that's most fun for the chickens to scratch through. Just don't use pine shavings though, they'll turn to mush. Use different types of plant material, of different textures and size particles. Get something coarse and chunky to provide drainage and help grind the rest down - wood chips. Get some filler that will provide lots of carbon for the composting reaction - dry leaves, grass clippings, yard waste, etc. The chickens will provide the nitrogen and the stirring. There you go! That's what I have and I love it. Don't forget to collect and save your bagged leaves, to add to the run periodically throughout the year (especially in winter, when there isn't anything else readily available to add). They don't last long in the run - the chickens will shred them into nonexistence within a week or two - but the shredded leaves provide easy carbon to the composting system.