Hello Jarod,
Thanks for the questions about adding multiple background images. Currently, the functionality will not let you add multiple background images unless you’re editing pages. There you can GridBlocks with multiple image backgrounds. You can see how to use the parallax effect (which uses multiple image backgrounds) in this article. For the front page, it will require that you scroll down until you see a different section. You can click on the editor in the right corner of that section and you’ll see a dialog pop up bringing you to the page editor.
After you get to the page editor, you need to click in the middle of the page in order to bring the menu up and you’ll see the option to change the background.
I hope this helps to answer your question, please let us know if you require any further assistance.
Regards,
Arnel C.