With the SharePoint Color Palette Tool you can change the color of a SharePoint site easily. Just pick one main color and the tool will generate corresponding colors for the palette. You can do this as following:
- Download and install the tool from the Microsoft Download Center
- Open the tool
- Choose the Color button
- Select the main color you want to use by using the Eye dropper
- Select the color you want to use and click Ok
- Select Recolor and the palette is rendered
- Now you can save the palette as a .spcolor file
- Upload the .spcolor file to the Themes folder (http:// [your site] /_catalogs/theme) via the browser or SharePoint Designer
- Go to the Site settings and choose Change the look (it is not required to have the Publishing feature enabled)
- Select the Current look
- Select your palette from the Colors drop down and choose Try it out
- If you like what you see you can decide to keep it
- You have to change the look for every site in your site collection. To change all the sites in your site collection at once you can embed the .spcolor file in a Design Package.