The cover page of your presentation is important: it will be sitting on the projector for a long time as the audience comes into the room, and even more important: it determines how many people will open your deck on online presentation sharing platforms such as SlideShare.
Presentation designers (including me) still have lots to learn from book cover designers. I enjoyed browsing through this book: The Best of Cover Design: Books, Magazines, Catalogs, and More (affiliate link). It reminded me of all this design options I have in PowerPoint that I actually do not use at all for cover slide design.
There is some irony though. The introduction of the book states that the cover designs presented in the book are proof that print media is here to stay forever. I disagree, we digital designers are learning to bring the quality of digital design up to the same standard as print.