Color: Allows the user to change the color scheme of certain themes
Color module allows a site administrator to quickly and easily change the color scheme of the entire site. In order for color module to work however, a theme must be specifically designed to use the color changing features. The default theme, Garland, (as well as its fixed width counterpart, Minnelli) was designed to take advantage of these features. With color module, you can easily change the color of links, backgrounds, text, and more depending on which color module enabled theme you are using. Color module requires your file download method to be set to public.
It is important to remember that color module saves a modified copy of the theme's style.css file in the files directory, and includes it after the theme's original style.css. This means that if you make any manual changes to your theme's style.css file, you must save your color settings again, even if they haven't changed. This causes the color module generated version of style.css in the files directory to be recreated using the new version of the original file.
More about color module:

How to use the color module!
If you have enabled the Color module but don't know where to find the "color picker" (which is what you need to find in order to use the module) then go to your theme's configuration page (i.e. hit the "configure" link for the relevant theme at admin/build/themes). If you don't see the color picker then use the troubleshooting link above (this actually takes you to a page titled "Color picker doesn't appear on theme configuration page").
Don't forget also that the color picker will only be visible if the theme actually supports color.module.
For advanced users
If you want to use color.module in conjunction with the "private" download method then there are a couple of options:
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