Dreaming of a background means your mind is wandering, and not very present. Imagine yourself having a conversation with a friend, and all your eye movements are focusing on the surroundings rather than your friend, this would indicate your disinterest to whatever the topic of conversation is.
In your waking hours, focus on the present and everything will slowly show its true form and intentions to you.
In a dream, you may see yourself as part of a larger picture. It is a sign that you are part of a much bigger picture even if you are partaking in a small part in the background for the time being. A symbol that points to the fulfillment of your goals and aspirations.