Web-Usability choice of color?

I'm writing a Thesis on Web usability. Now I would like to mention the choice of colors. Which one should you use and which not. Now I have searched on the internet but found nothing suitable to the subject. It actually does not matter what color I use. But should I rather use bright colors or rather dull colors? what color stands out more in the eye? Why?

If somebody can help with web-usability, this will be grateful.