I had a decorator that I hired for limited assistance, mostly to help with colors as I know how hard it is to select. She was the one who suggested Winds Breath with Cloud White for the trim. We actually have regular ceiling white but in hindsight, I would consider the cloud white for the ceiling as well. But I don't think the ceilings make the trim look dingy nor yellow. It looks creamy. When there is a lot of light/sunlight, you almost can't tell that it is off white. It just gives an impression that the space is not sterile (I am not a "clean white" house person- i.e. I prefer lots of wood and warmth). Agree with the other posting about painting larger samples and look at it at different times of the day. The thing about paint that amazes me is how it looks very different in the light and how much you need to match the undertones of a color, even a neutral one. Hence, the few hours of a decorator's time was money well spent!
Q