If you add a slideshow to play as your desktop theme, you have customized your system software.

Slideshow

A presentation of a series of images or slides displayed in sequence, often used for demonstrations or educational purposes.

Desktop Theme

A collection of settings and elements that determine the visual appearance of the desktop and applications on a computer, including wallpapers, icons, and color schemes.

System Software

Programs developed to serve as a foundation for other applications, such as operating systems and utilities.