Sometimes people think of decorating as a choice between two extremes - blah neutral and wild color. The truth is that most colors can work as neutrals by using more sedate tones. Yellow is one of the colors that does this extremely well.
When there are more attention-seeking colors in a space, yellow can easily bring some life to the neutral areas without immediately drawing the eye in. Yellow also compliments many other colors quite nicely. In a warm room, use yellow to create some contrast without straying too far from the primary palette. A neutral yellow also has the ability to add life to a cool blue room. It can ground the more intense colors and contrasts with just the slightest hint of warmth.