Colors are surrounding you and each color affects you for they are vibrating on their own level: giving you a certain type of energy.
Mostly it is a positive energy, but it can happen that you basically have an overdose of that certain color, or a certain color is just making you sad for some reason - like it reminds you to a bad event or memory.
If you remember, we wrote a post about The 7 Main Chakras. Each of the 7 main chakras are connected to a color that can refill it with energy and if in lack of the colour, the chackra may not be able to get refilled.
Let's see what effect a certain color has on you:
Red
Red is connected to