Make a tilt shift photo where objects and people look miniature. I love this effect. Your class will have great fun playing with this tool and making art.
http://ictmagic.wikispaces.com/photos+&+Images
Microsoft's Photostory is a great piece of software to make video presentations from Photos. Designed for XP, but works on newer Windows as well. http://ictmagic.wikispaces.com/Photos+&+Images
An iOS and Android app from Google designed to scan printed photos to make a digital version using the device's camera, but it is very good for scanner students work too.
This is one of the most comprehensive image editing sites I've seen. There are lots of effects to select and you can even make photo collages. It's easy to use and great for all sorts of projects.
http://ictmagic.wikispaces.com/photos+%26+Images
Another site with access to free photography is STOCK.XCHNG. Some of the listed photos cost, but there is a section of nice photos that are free to use.
Make a video slideshow using your photos and audio files with this useful site. [Be aware - Not all user generated content is suitable for children]
http://ictmagic.wikispaces.com/photos+%26+Images
Stupeflix is a video creation tool made from your photos. There are of templates which makes this site really easy to use.
http://ictmagic.wikispaces.com/photos+&+Images
Flickr is almost certainly the best online photo management and sharing application in the world. Show off your favorite photos and videos to the world, securely and privately show content to your friends and family, or blog the photos and videos you take
A great site that lets you make a sliding photo banner from any Flickr photostream or sets. Embed the banner into your site. No sign in required.
http://ictmagic.wikispaces.com/photos+&+Images