The colour yellow has both positive and negative connotations.
If the dream is a pleasant one, then the colour yellow is symbolic of intellect, energy, agility, happiness, harmony, and wisdom.
On the other hand, if the dream is an unpleasant one, then the colour represents deceit, disgrace, betrayal, cowardice and sickness. You have a fear or an inability to make a decision or to take action. Your desire to please others is at the risk of sacrificing your own needs and happiness. As a result, you are experiencing many setbacks.
To dream of a yellow room suggests that you need to use your mind. You are feeling mentally stimulated.