Themes for your presentation are designs that apply to every slide you add. You can either choose one of Google presentations themes or pick your own background image and color for your presentation. There are also many presentation theme designs in the Google Docs template gallery.
Aviary is on a mission to make creation accessible to artists of all genres, from graphic design to audio editing. They offer free image, vector, audio and music editing tools. Sign up to be a beta tester to get free student accounts that are walled off from public viewing. You can also learn more about them through their blog at http://aviary.com/blog.
At ISTE, Mimio introduced a rechargeable interactive polling system, a document camera with two adjustable light sources, and a new portable device for writing on projected images. You can watch videos of the products in action here.