Dreaming of a brunette means letting your hair down and enjoying a sensual moment. It is your goal to be able to relax with whatever or wherever life takes you. You wish to be less stuck up and less judgemental of people that you meet by understanding their perspective. When in Rome, do what the Romans do. Letting your hair down is a good start.
Release your limiting beliefs and become more sensual by doing stuff that makes you feel sexy. If you have dark hair, then lighten it a little. If you have blond hair, then darken it a little.
I dreamed about meeting a brunette at my new job. I am normally attracted girls with jet black hair, but we really hit it off in the dream. Now I am always looking to see if someone is a brunette at my work place.