This very short version of Google Apps for the Class shows off a couple of neat things that you can do with adding images to Google Presentations.
Animated Gifs: Did you know that you can input animated gifs into a Google Presentation? Well, I personally didn't even know that websites used animated gifs anymore, but here's a whole bunch of holiday themed gifs!
http://www.webdeveloper.com/animations/Holiday.html
Incremental Reveal: Presentations never had a lot of capabilities for animating your slides, but it does allow you to slowly reveal images in a presentation. Have fun!
