All your desktop features can be personalized through the KDE Control Center. Here, we will focus on how to change the look and feel of the Desktop and the Panel.
To change the desktop color scheme choose + + + → from the main menu. In the Color Scheme list there are predefined color schemes. Select the one you like and click on .
You can also define custom color schemes: click on the element you want to change (for example, Active Window to change the active window colors), then on the color bar, choose the color you like and click on to apply it.
To change the desktop background, choose + + + → from the main menu. Select the Picture option in the Background section and background scaling, colors and blending in the Options section.
KDE's Panel is highly-customizable. All features from the Panel's position to its appearance can be set up to better suit your preferences. Right click on the Panel and choose from the menu that pops-up.
You can also enrich the Panel with the applets you use most frequently, to have them handy. Right click on the panel and select from the menu that pops up; then search and add the applet you want, in the example we add a file find and web search applet.