You can create images with the Cover Reveal Book Templates in the Custom Creator by choosing "Reveal" in the Book Template Step. Here are just a few of the options:
You'll also find Community Templates that feature Cover Reveals. To find these, click on Templates in the Custom Creator, then Community Templates and filter by Reveal under 3D image.
Here's a handy video showing how to create cover reveal graphics: Watch Now
Also read this handy blog post to give you ideas about Cover Reveal images: https://bookbrush.com/8-best-book-cover-reveal-templates-graphics-mockups/
