To achieve balance in a color scheme, a strong color is paired with another strong color, in terms of both value and intensity. Lower intensity colors create a calm, restrained mood that’s subtle and serene, while higher intensity colors create a more energetic vibe. Intensities of paired colors should be equal, or nearly equal. Light and medium values work well together. To liven up a light-value schemed room, include an accent of darker value. A room with a light blue and light yellow color scheme with a touch of navy blue gives depth. Adding the complement of a pure hue will make it softer and less intense, thus achieving balance.
via Home Adore