Color green is mostly associated with the emotion envy.
Black usually represents sadness, or mourning. That is why it is the color of funerals, in Western cultures. Black is also a calming, and to some a reassuring colour, the colour of the night sky and...
yellow is a sign of happiness. it makes you feel bright and refreshed. yellow is the colour of sunshine and makes us feel calm.
maybe peace but it would mean different things to different people
Indigo is compassion, labor, feeling for one.