Color does affect your mood and mind set. There have been studies done on this several years ago. After reading about this I set about to do some test myself. In a room with mild pastel colors people are calmer and more at ease. In a setting with darker colors such as reds people are more aggressive. You will find that most restaurants use darker colors because it makes people more hungry. Dentist offices painted in pastel melons and soft mauve the patients are calmer. Classrooms are often painted in cool greens and some blues because of the calming effect.
For myself when I am going through a rough patch in my life I notice I tend to wear darker tones. And during happier times I noticed I will wear brighter, cheery colors. If you notice people around you, it will become evident which ones are more positive minded simply by the clothes they usually wear.