Knowing how to change your Chromebook wallpaper and themes will allow you to customize your desktop and Google Chrome. You can even choose one of your images for your Chromebook’s background.
Chromebooks – Change Wallpaper and Screensaver Settings
Chromebooks are lightweight laptops designed primarily for productivity applications and web browsing. In addition to several pre-installed wallpapers, the Chrome Web Store has numerous free themes that change the look and feel of the Google browser. Although there are many models available, the Chrome OS interface is standard on all devices, so the steps for changing the wallpaper and theme are the same for all Chromebooks.
To choose a different desktop background for your Chromebook:
Select the taskbar menu in the lower-right corner of the desktop, then select the Settings gear to open Chromebook settings.