All you need to do is go this page, expand one of the categories, open the image, and save it. Once the download is complete, right-click on the image to set as the desktop background or wallpaper.

Say you're creating a class presentation and want to add the school logo to the page ... background afterward. This ...

If you use the traditional method to add a background image to your spreadsheet ... By default, you can go to the Page Layout tab and click the Background option to add a picture to the background.