Color yellow in a dream represents borderline tranquility. At any yellow juncture, the senses are ready to go to a new level, while waiting on that imminent change as a signal. After the dream of yellow colors, you will wake up refreshed without a doubt on your mind, as you have experienced the warmth of the mellow color.
There are negative connotations attached to yellow, as it is often associated with being a coward. You are so stricken with fear that you turn yellow.