The coolest nests i've seen are the ones somebody made out of those 5 gallon jugs of oil for cooking. They're kinda square and they cut our an area in the side of the jug, but in bedding and bam. You have a nest box. My chickens would love it. I just keep forgetting to go around and ask for the jugs. I used a small carrier once because my AO didn't want to lay her eggs on the shelf where the others do. So I gave her a crate. Then the others started using it and she quit. I have even seen people use litter boxes. The ones with the top. Five gallon buckets turned on their side. Small storage containers, without the lids of course.