To compare how your site will look like when you use several background images
from an online resource, you can do a quick exercise by inserting the image onto
global.css file and review it on your web developer tool
before making a decision.
Just go to your PrestaShop front office. Open your web developer tool and view
On another browser, go to a web resource for background images that you want to use. As an example, go to http://www.free-backgrounds.com
Choose one of the background thumbnails you'd like to review. Click on Preview. It will open in a new page. Then right-click on any part of the background, and click on View background image using Firefox. Click on that link. ...