I love an all white room! I think it depends on whether you want the trim to stand out a bit or blend in. I just painted my living room SW Honied White and I am doing my trim in a white white to match the wooden blinds. I also considered staying with the same color and doing the walls in an eggshell and the trim in a semi-gloss for some subtle contrast. I ultimately decided I wanted the trim to match the blinds, but either way would have been good.

The wall amd trims could be a slightly different color.

I paint them the same color, but a different finish (eggshell and flat).

An all white living room

painted in our glace