tray ceiling paint colors?

hi. we want to paint our MBR walls and ceiling. walls will be a light yellow or tan. maybe a silly question, but how do I handle the ceiling and recessed tray?

is the ceiling and tray all one color? if not, is the tray usually lighter or darker than the rest of the ceiling? and are they both lighter or darker than the walls themselves? or does the tray pick up the wall color or something?

hopefully that makes sense. I am sure preference comes into play but what is more common (thinking resale)?

cheers,

thb