Here is a list of resources for having students work with photographs.

Animoto:

Turn your photos & videos into pure amazing.

Animoto automatically produces beautifully orchestrated, completely unique
video pieces from your photos, video clips and music.

Smilebox:
Similar to Animoto, you can make slideshows, scrapbooks, etc... You can also add text. Another way to combine writing, images, and music.

Flickr Creative Commons: A source for images that students can use for projects. They have different levels of licensing, so be sure to comply with the wishes of the creator.

Wikimedia Commons: Another site where students can get material that is available for usage.