This tutorial show how to change Drupal template color scheme.
Using the Firebug plugin or other browser developer tool you can investigate your page and check if your design uses plain CSS colors or complex background images.
Learn more about browser developer tools
In case your design is created using plain CSS colors you can open the CSS file from the themes\theme### folder and change the color codes.
Otherwise you’ll need Adobe Photoshop application to edit template source files and change design images.
Feel free to check the details video tutorial on how to change Drupal template color scheme using Adobe Photoshop: