I've read/heard that chickens like to lay their eggs in dark places. My coop isn't going to be very dark so I was thinking painting the nest boxes a dark color would help. I'm also thinking about using curtains.
They do get painted but it's the same inside and out for my ease of use and care. they get fresh paint every yr but the color is whatever I have on hand to mix, last year it 30 gal to paint it inside and out.