After creating several book sale flyers showing the products head-on (flat), I decided to create a 3D look for the books instead. Each book was photoshopped onto a 3D book template and arranged so that the cover for each was still clearly visible. I experimented with a different layout for each page depending on how many products were in the given category.
Ultimately the result, although visually interesting, was also visually overwhelming. I would ultimately use a lot more white-space if done again.