I've just been reading this article from Mitch Meyerson, in the latest issue of his Success Strategies Online Newsletter.
It's about the importance of colours on your website and other marketing materials.
Here's what Mitch says about colours and the emotions they communicate in a business context:
Red evokes aggressiveness, passion, strength, vitality. In business, it is great for accents and boldness, stimulates appetites, is associated with debt.
Pink evokes femininity, innocence, softness, health. In business, be sure you're aware of its feminine implications and associations.
Orange evokes fun, cheeriness, warm exuberance. In business, it's great to highlight information in graphs and on charts evokes positivity, sunshine and cowardice. In business, it appeals to intellectuals and is excellent for accenting things. Too much is unnerving.
Green evokes tranquility, health, freshness. In business, its deep tones convey status and wealth; its pale tones are soothing.
Blue evokes authority, dignity, security, faithfulness. In business, it implies fiscal responsibility and security. Plus it is universally popular.
Purple evokes sophistication, spirituality, costliness, royalty and mystery. In business, it's right for upscale and artistic audiences.
Brown evokes utility, earthiness, woodiness and subtle richness. In business, it signifies less important items in documents.
White evokes purity, truthfulness, being contemporary and refined. In business, it enlivens dark colors and can be refreshing or sterile.
Gray evokes somberness, authority, practicality and a corporate mentality. In business, it is always right for conservative audiences.
Black evokes seriousness, distinctiveness, boldness and being classic. In business, it creates drama and is often a fine background color.
Fascinating stuff and worth thinking carefully about when planning your site.