I'll upload a pic of it tomorrow, it's dark already.
I have in one run, a "tent" made out of long branches with a tarp stretched over the top, and more logs and branches piled up at one end. I put some sand under there. my chickens and muscovies love it. They jump up on the cross piece, or perch on the supports, the chickens dust bathe under the tarp, even when it's raining. It also provides shade and a dry spot to get out of the rain.
In another run, I took about 8 hazel saplings, cut the bottom at an angle and stuck them into the ground in a circle about 4-5 inches deep. I then bent them over towards the center of the circle and bent them around the saplings opposite. I ended up with a sphere of hazel. I filled in the gaps with smaller branches, also stuck into the ground.
The chickens in the run go inside for shade and protection when the hawks are flying, they also like jumping on top too.
I don't have any pics on the laptop, but I'll take some after work tomorrow and upload them here.