Well picking your favourite colour gives you some indication of your personality traits.
So if you picked:
Blue – you are sensitive, kind but with a tendency to be moody and can suffer from depression or be very introspective and withdrawn.
Red – you are energetic and impulsive but also prone to outbursts and somewhat reckless.
Yellow – you are creative and intellectual, organized and good at prioritizing. Can be subject to ilnesses related to the immunosystem.
Green – You are balanced (or try very hard to be), close to nature and like open spaces and do not like to be crowded or still for too long.
You can be too much or little thereby emphasizing the charachteristics of the colour you chose. Two or more colours of the wider spectrum can be chosen to give clarity and specifics.