crtrlovr
Still chillin' with my peeps
I too tried a few different mediums, and what works best for my gang is hay. Straw is more slick and they didn't like it and wouldn't lay on it at all, preferring to lay on the floor rather than in the boxes w/ straw. They LOVE the hay, it stays clean unless some wiseacre decides to sleep in the box, and when it does get dirty, like someone else said, it's easy to lift out the whole mass & toss it in the compost heap. I have strange nest boxes; the ones I thought the girls would LOVE and would be perfect they basically ignore. Their two very favorite nest boxes are an old suitcase w/ hay and an old dresser drawer (also w/ hay). They will stand in line to use either of those, and if it happens to be occupied, they're not above pecking the occupant to try and "hurry them along", or just down right run 'em off! bad girls!
The bantams have started to lay in 1 of the first ones I thought were perfect, so maybe somebody will make use of them.

