How do you pick the colors that you use in logos and sites? I've been using Photoshop's color libraries for years to find attractive color combos, but I wanted to see how others have approached the task.
http://kuler.adobe.com/ is a really good resource for this. You can name a general description of a color you want ("dirt" or "angry" or "light blue" or "cloudy"), and you'll get a ton of color combos, with a ton of complimentary colors thrown in for free.
Back in 2007:
"If I ever need to do things like come up with ideas observation of nature and complex systems such as the web is always a good place to start. Here I'm looking at colour & colour schemes. Never would have thought of this combo and ratios" ~ http://www.flickr.com/photos/bootload/541666109/
And moving beyond the visual to branding: if there is an entrenched competitor in your space that uses a certain color (lets say blue), pick an opposite color (say red or green). If you color your logo/colorscheme the same as them, you are just confirming visually that your brand is a copy of them, and not positioning yourself as different, which will make it harder to compete (gain mindshare as the marketers say).
If you're really interested in how artists approach color and theory, you might pick up a copy of Kandinsky's Concerning the Spiritual in Art, which puts forth a modernist/Bauhaus color theory:
Thanks for the links. IMHO artists have tried for centuries to capture 'moods' with colour and they did a much better job that I could ever do.
Kandinsky's book is interesting even if what he is saying is mostly metaphorical. However, some of his observations were spot on as that of describing the case of the German patient with color synesthesia. http://en.wikipedia.org/wiki/Grapheme-color_synesthesia
I use a lot of the sites mentioned elsewhere on this page, but other than that, one thing I also do is find pictures with color combinations in them that "jump out" at me and then sample those colors into a palette. This is how to get the most interesting combinations in my experience.
In the same way that I wouldn't ask an artist to design a software library, I don't expect myself to choose colors, layout, or design correctly. When shown choices from designers, I can tell which ones I like, and which ones work, and so on, but hacking graphic aesthetics is something that takes years to get good at, as any kind of hacking.
I would recommend that you hire a designer, or make friends with some designers who can help you with this.
I usually consider the psychology of the colors I use, especially from the point of view of whether or not I am designing a commercial site. In addition it is important to consider the age group of your website visitors.
I've written an article about my take on color psychology in web pages:
http://aviary.com has a great color picker called Toucan. It allows you to pick colours spaced out around the colour wheel based on a few parameters. Also does the colour-blindness emulator. You can check out colour palettes that others have created as well and modify them to become your own as you see fit.
I see alot of posts from the design perspective but what is your brand trying to convey? Who are your customers? The sure fire way is to generate lets say 20 schemes, get friends, family, and biz partners to vote on their top 5. Get a collection of top 3-10 color schemes and show them to possible customers. Take their input and there you have a color scheme that has a high likelyhood of working for your target market. Attractiveness does not equal branding good, ex this famous brand: http://www.arrogantbastard.com/
As you see the color schemes are only there to accentuate the brand. Do customers buy teslas in order to be green or because their a luxury sports car? Their color scheme is chosen on the basis of their brand and who their customers are.
The colors you choose shouldn't matter on what others choose. The colors you choose should convey your brand. Doing something different with your color scheme may even be a benefit in regards to being the purple cow.