Usually white eggs come from chickens with white feathers and brown eggs come from chickens with red feathers. American have become accustomed to white, so most eggs are bleached. There are some blue chicken eggs. They come from Araucana chickens.
Just regular old farm chickens lay 2-3 eggs per week. Less than that and the farmer figures it costs more for feed than he's making from eggs, so guess what's for Sunday dinner?