That is a question I am always asked! I have a few standbys that I always seem to use. Of course, it all depends on the room, the light and whether it needs to go with existing fabrics or wallpapers. I usually gravitate to warm white colors. They seem to go with everything and are not too stark.
Sherwin Williams “Alabaster”
Benjamin Moore Decorator White
White, but warm
Sherwin Williams “Creamy”
White, warmer
Sherwin Williams “Dover White”
White, warmest
Benjamin Moore “Linen White”
Another tip:
I usually paint my ceilings 1/2 of the trim color so they appear to match!
Happy painting!!