You can basically apply a background image to anything within the Divi Builder. Whether it’s a section, row, column or module, the possibilities are endless. And with blend modes, you can even make background images show through selectively. This allows you to make modules to connect with each other on another level. Where one module stops, the other module takes over. They don’t behave as separate elements anymore but, instead, help you get a view of the overall design.
Alternatively, read the full tutorial.