It's a bit of a silly question, isn't it ?
Let's give a serious answer though.

For textual content, black text on a white background for the best readability, and blue (with underline) for links. For images, anything goes. Not happy with it ? Then call in a designer for help. And believe it or not, it's actually a trend...

Oorspronkelijk geplaatst op Quora: What colors work best on a website?"