What does your favorite colour tells us about you? We live in a colourful world and the colours we like can tell others or ourselves what we need, what we like and what we are longing for. Let me give you some examples:
Black: appearance of mystery, suppress desires, hidden depths, inner longings
Grey: hard working, caution and compromise, looking for peace and composure
White: perfection, purity, innocence and a desire of a simple life
Yellow: adventurous, sense of humor, intellectuality, happiness
Red: optimistic, aggresive, impulsive, extrospective
Blue: introspective, patient, sensitive, faithful and caring
Green: community minded, reputable, balanced, peaceful
You could write a book about colours and personality and it is already done, "A Dictionary of Colour: A Lexicon of the Language of Colour".