Importance of room colouring with respect to psychology 
Colour psychology is the study of hues as a determinant of human behaviour. Colour psychology is also widely used in marketing and branding. Marketers see colour as important, as colour and can influence a consumers emotions and perceptions about goods and services.  
 
Examples of colour psychology below with respect to various colour factors with nature 
 
Gray feels serious and professional.  
White makes you feel pure, fresh and clean.White evokes purity and innocence and creates a minimalist aesthetic. It can be very simple, clean and modern. It’s also the most neutral colour of all.
Black feels sophisticated and serious. Black evokes power, luxury, elegance, professionalism and simplicity. It is bold, powerful and a little mysterious. But black can have some negative connotations, as well. It is the colour of mourning, fear and sadness and it can feel intimidating and unapproachable as well.
Blue makes you feel safe and relaxed.Blue evokes feelings of calmness and spirituality as well as security and trust. Seeing the colour blue causes the body to create chemicals that are calming.
Green makes you feel optimistic and refreshed. Green symbolises health, new beginnings and wealth. Green is the easiest on the eyes and should be used to relax and create balance in a design.
Yellow makes you feel happy and spontaneous.Yellow is perhaps the most energetic of the warm colours. It is associated with laughter, hope and sunshine. Accents of yellow help give your design energy and will make the viewer feel optimistic and cheerful. However, yellow tends to reflect more light and can irritate a persons eyes. Too much yellow can be overwhelming and should be used sparingly. In design, it is often used to grab attention in an energetic and comforting way.
Orange makes you feel energised and enthusiastic.Orange enhances a feeling of vitality and happiness. Like red, it draws attention and shows movement but is not as overpowering. It is aggressive but balanced, it portrays energy yet can be inviting and friendly. Orange is great for a call to action to buy or subscribe to a product.