When using WPF (Windows Presentation Foundation) for creating user interfaces, coordinating the color of a button when it is pressed is important for user experience. You can use the 'Background' and 'Foreground' properties to set the colors. For a button that changes color on press, you can use a 'ButtonBase' event such as 'Click' and apply a color change in the event handler. This can be achieved by changing the 'Background' brush to a different color when the button is in the 'Pressed' state. Additionally, consider accessibility and consistency with the application's design theme.