System Settings/Appearance
The appearance section contains all the settings for customizing the theme of Plasma and the applications.
Application Style
Widgets are the interface elements such as buttons, scroll bars, tabs and so on. Here you can choose and configure the widget style used for all KDE applications. You can also fine tune widget behaviour. Global Theme
Customize Plasma in one click. Color
Here you can choose which color scheme to use on the desktop and in applications. You can also tweak the settings for individual elements. Windows Decorations
This module allows you to select a style for the buttons and borders around windows. Fonts
Configure the font used by your system. Icons
Here you can choose which icon theme to use for your workspace, and how large you want them to be. Cursors
Change the look of the mouse cursor. Font Management
Manage the fonts installed on your computer. Splash Screen
Change the splash screen.