Personalizing your computer with a new wallpaper or fresh theme is one of the first things people do when they initially set it up, and Chrome OS is no different. Here’s how to customize the background and theme on your Chromebook.
How to Change Your Wallpaper
When choosing a wallpaper to use on your Chromebook, you can select from a wide range of pre-installed images or any of the images saved to your computer using the Wallpaper app.
The first thing you’re going to want to do is to open up the Wallpaper picker. Right-click—or two-finger tap—anywhere on the desktop, then click on “Set Wallpaper.”
The Wallpaper picker opens in a new window, and you have a few options to choose from for your new background. Select one of the categories from the left side of the window, then click on one of the many pictures on the right to set it as your wallpaper.
By clicking on “Daily Refresh,” located at the top of the picture selections, your desktop wallpaper will switch to a new image at the start of each day. This is great for those of us that often get bored of looking at one picture for too long.
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Source : How to Change the Wallpaper and Theme on Your Google Chromebook