UI and UX 101 for Web Developers and Designers
I agree that colors are a big factor for websites, just like they are for other things. For example, the color yellow is used for most road signs and school buses because it's one of the first colors that catches our attention. Warmer colors seem to have more energy, while cooler colors tend to relax. Lighter colors feel "lighter", while darker colors feel heavier. The way you color your website does just as much to set the theme as your content does.