A few weeks ago I started thinking about emotions, feelings, memory and etc'.
I don't really know why it came up to me. Maybe because I was starting to think that everything is so depressing, and maybe we have a way to change it. Even a little bit.

Anyway, I wasn't really surprised to discover that I was right. Colors do affect our emotions.

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On this picture, you can see what each color makes us feel.
Pablo Picasso said "Colors, like features, follow the changes of the emotions".
Artists and intreior designers believes that color can affect dramatically moods, feelings and emotions.

Can we use colors as therapy?
100 times yes.

Several ancient cultures, including the Egyptians and Chinese, practiced chromotherapy, or the use of colors to heal. Chromotherapy is sometimes referred to as light therapy or colorology and is still used today as a holistic or alternative treatment.In this treatment:

Red was used to stimulate the body and mind and to increase circulation.
Yellow was thought to stimulate the nerves and purify the body.
Orange was used to heal the lungs and to increase energy levels.
Blue was believed to soothe illnesses and treat pain.
Indigo shades were thought to alleviate skin problems.

Red

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The color red is a warm color which can evoke strong emotions. We can often associated with love, red can make you feel comfortable, as if you're surrounded with warmth.
Perhaps the first thing you think about when you think of the color red, is romance, and there is a reason for that. Thousand of years ago, the Greeks tied the image of red roses to Aphrodite (the goddest of beauty & love). Since then, this color remains a classic illustration of love and passion.
However, you may be more prone to anger and irritation when looking at red for a long time.

Blue

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Blue usually evokes a sense of calmness. It is probably the most abundant color in your life: from the wide blue sky to the soothing ocean, from your everyday pen to a pair of jeans. According to Kate Smith, color expert at Sensational Color, blue has a “real trust factor.” That is why blue is a popular color for military and police uniforms. Moreover, blue slows down your breathing and heart rate, giving you a sense of serenity and stability. You feel a bit more grounded, a bit more at peace; you feel more certain at yourself and your thoughts.
Many people consider blue the color of melancholy and depression. For me, anyway, the color blue defently present calmness.

Yellow

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Usually associated with the sun, yellow is a bright and cheery color.
It is regard as one of the happiest colors in the color spectrum, and seeing yellow can spark optimism and creativity. this color attracts attention, as evident in warning traffic signs and school buses.
Since it reflects a high amount of light, looking at yellow for too long can tire your eyes. Long exposure may even cause frustration and anger, as researches and interviews have shown that in yellow rooms, babies cry more often and adult’s tempertends to flare quicker.
However, if used appropriately, yellow can make your day much better. It is a color of joy.

White

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White gives you a sense of space, or purity and serenity. It is a calming color, similar to blue, but simpler and more comforting.
Many people see white as a lack of color. It represents cleanliness and can help to declutter your mind. People also think that white is like a blank slate, like an empty piece of paper that can stimulate imagination and creativity.
Too much white can give you a feeling of isolation and coldness. Nothing happens when you look at white, because it is neither warm nor cold. It seems empty and simple, maybe too simple. Rooms painted white appear more spacious, and while in some cases this might be useful, it can make the place too professional and unfriendly, as felt by many patients in hospitals.

Black

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Black is famous for its negative connotations, from an icon of evil to the color of mourning.
It absorbs all light and does not reflect back; it is, like white, a lack of color, and yet it is the symbolic opposite of white.
Black can bring your mood down and make you feel more anxious than usual. Black feels like a shadow, like an unknown mysteriousness, and humans fear the unknown. This links back to our survival instinct, in a way, because what we do not know and can't see in the dark may kill us. Perhaps that is why the color black becomes connected to everything that we want to avoid, such as death, evil, diseases, and bad luck.
Nowadays, black is considered a high fashion color, one that can slim you down and make you look more elegant. You feel more confident, more mature, and more in control of your life while wearing a black outfit.

Thanks so much for the info on these articles:
5 ways these five colours affect emotion
Color Psychology: Does It Affect How You Feel?

So, next time you're gonna change your room's color, which one is it going to be?