1. Guess the meaning of Colours
Red
Purple
Blue
Green
Yellow
Black
White

3. Websites colour schemes:
Certain colours work well with specific types of businesses. For example, warm colours, such as reds, yellows, and oranges – often called a 'fiesta palette,' can work well for food sites and restaurants that offer spicy fare.
Colours in the warm range can also be effective in selling products associated with sun and passion.
Creams, whites and dark brown colours can be used successfully on websites that sell chocolate products.
Cool colours, such as blues and greens, complement outdoor products, airlines, medical services, law firms and intellectual content. These colors can reflect trust or a relaxed attitude. "… the colour blue has a relaxing effect on the nervous system, and some studies have shown that it increases productivity when used as a background colour.
However, don't use blue in your colour scheme if your product is food-related, as blue is a natural appetite suppressant."

4. Saturated v Desaturated backgrounds

5. Must nots: Don’t use Red and Green together
People who are colour blind don’t recognise these colours.

6. Do’s: Use high contrast (reduces eye strain).
Consider your audience and purpose.
Choosing colours on opposite ends of the spectrum creates a visual harmony for the eyes.
A high contrast between elements makes text easily readable, and guides your reader’s attention.
The brighter the colours, the more mental energy they will consume.
Use tools such as Kuler and Color Scheme Designer 3

7. http://www. instantshift
Explore this website to get some ideas of using colour in websites.