This is one of the BEST idea's I've seen: https://www.backyardchickens.com/web/viewblog.php?id=25889
Here is another idea:
https://www.backyardchickens.com/forum/viewtopic.php?id=32283
Here is another idea:
https://www.backyardchickens.com/forum/viewtopic.php?id=32283