Baseballs start off pretty much white, but before being used the umpires rub the balls with a special mud fron New Jersey which changes the color to off-white.
Many breeds come with white feathers. Too many to list for you here. I have provided a link so that you can check out all the different breeds available in white.
Off white is created by adding just enough of another color to tone the white down slightly. Adding a small amount of Payne's gray will tone the white down slightly. Using a small amount of burnt...