Well with the Presidental Campaign in full swing ads are all over the media. How about having your students use Animoto or another video tool to make their own campain jingle. A great website that might be able to help you is the
Living Room Candidate it allows you to use video, audio, and images from the site to create your own add.
It has titles, effects and transitions as well.
It also has lesson plans on how to evaluate politcal adds, what makes an add effective, and other topics.