I just put up 4 YouTube videos — just 40 seconds each — showing the book covers in each category — in a playlist.
I also put the videos on the category homepages on the Red Dot Book Awards site, replacing the previous Picasa Slideshows (as I realized that I couldn’t easily re-use those slideshows, e.g., to send out to my English teachers in the run-up to voting). YouTube videos are much more easily shared and spread. (My apologies if you don’t like the background music I chose for each. The mute button is always an option.)
Anyway, here is the playlist.