Anyway, I'll show some examples of various trailers, but I'm also going to walk the teens through how I made one myself. For that, I figured I'd make a new one, as my old Flyy Girl trailer is, um, a bit risqué. (Also, complicated to create.)
So! I chose the book Son of the Mob by Gordon Korman, as I read it last year and loved it. Made the following trailer in iMovie:
Then, I decided to try out Animoto. And guys, Animoto is fun. And SIMPLE. I'm going to use the one I made using that program for my step-by-step trailer how-to, because it is WAY easier than iMovie. (The downside being that, with a free account, you can only make videos that are quite short. Still, that just forces you to be creative. Editing for the win!) Anyway, here's the trailer I made with Animoto: