Colours have a great impact on our lives.
According to psychologists, the colours affect our emotions
and the way we feel .
our emotions are greatly affected by colours.
to suit the mood of the occupants in offices and hospitals
when it comes to the interior design of offices and hospitals.
I don't think "occupants" is the right word used with "hospital".
Color and human's feeling was already discussed for long time
The relationship between color and feelings has been the focus of many scientists for a long time.
mentally illness patients
mentally ill patients
colors can also
effect affect human feeling
In US, people express their coziness with blue and gold already used by Jung in psychotherapy.
This example adds no value to your conclusion and it has been used in your first paragraph.
You have many interesting examples in your essay; however, your writing style makes me feel like reading a journal article. In each of the paragraph, you should state a reason, give an explanation and then give examples for it rather than listing all examples.
Hope it helps!