The one thing to bear in mind with neutrals is that you shouldn’t go too dark - pale to medium shades are best. If you have one or more dark walls, the colour will become the focus of the room, which defeats the purpose. Neutrals also tend to be on the warmer side of the colour palette. Using light neutrals in a tonal scheme will create a softer environment. If there is a lot of natural light, then using soft, light tones will make a smaller room feel more spacious.
Not only do neutral walls make a great backdrop for a room, their other selling point is that they are unlikely to go out of fashion in the way that, say, a bright pink wall could. That means that once the wall is done, it will have longevity, which is a real buzzword as it means that this trend appeals to customers who want to save money and is also good for the planet.