It would depend what mood you're trying to set and the purpose of the room. How long do people usually stay there? What are they trying to do while they are there? A yellow kitchen can be energizing. A yellow bedroom might be distressing. Soft yellow, bright yellow, greyed yellow?

If you want a good answer you're going to have to provide some more details and a picture of the room in question.

We used SW Fun Yellow in our kitchen. You need to look at a sample fan, get a couple of different colors, paint some scraps or places on wall (after priming). Colors don't reproduce on phone or computer screens or I would post. But it is a nice yellow, not in your face bold.

SW Ivoire is a nice yellow.