A couple days ago I showed you an example of how a book cover could take advantage of active content. Here's another example, and like the first this one is intended as a proof of concept rather than a functional design.
Nate Hoffelder is the founder and editor of The Digital Reader. He has been blogging about indie authors since 2010 while learning new tech skills weekly. He fixes author sites, and shares what he learns on The Digital Reader's blog. In his spare time, he fosters dogs for A Forever Home, a local rescue group.