I saw a few posts about using an old tire to make a dust bath area for chickens, so when I had my vehicle at the shop, I asked if they had any old tires I could have. They did and gave me one!

I filled it with dirt, diatomaceous earth, wood ash, and sand, as recommended. It has been sitting at the end of the covered run for some time now. The chickens like to perch on it, but I have yet to catch one dust bathing in it. Next to it, yes, but not in it. Hmm.