The Colors settings of the KDE Control Center allow you to control the colors that are used for various window elements, such as window titlebars, window backgrounds, text, and buttons. You can change the color of each window element by selecting the element from the drop down list and choosing a color for it. You can then save your changes by clicking on Save Scheme.... This will save your settings in a Color Scheme file. Color schemes are text files, with a .kcsrc extension, that contain entries for each window widget and its color, in RGB format. It is also very easy to add color schemes that you have downloaded by clicking on Import Scheme... and pointing to the .kcsrc file. With color schemes, you can save the changes you have done in one convenient file or easily change to a predefined color setting, without having to change each window element separately.

Additional color schemes can be downloaded from the Color Schemes section of kde-look.org.