Go over to the Impression Obsession website, click on the link to the Gallery, it's the blue square next to the Mega Mount video, and it will load a slideshow of something like 47 examples of how to combine and layer the Cover A Card BG stamps. Even if you don't own many, or any, it will give you lots of inspiration. Here's the page to go to:
Impression Obsession Rubber Stamps: Cover-a-Card Stamps & Mega Mount
Of course, you can always do the surefire technique of emboss resist - ink up your BG with Versamark, emboss in clear, then go over it with Distress Inks. You can't not get a great BG doing that. Iron off the EP if you want, or leave it. Or emboss in white or a color.