JibJab is a fun site where you can take pictures and insert them into movies. I have picked two movies you can use Elf Snowball Fight and ElfYourself. There are many JibJabs you can make, but most of them require you to purchase a membership.
You will have to download pictures and then upload them to create your movie. Here is the link to the school pictures on Picassa. Just click on the the pictures you want to download. Right click on the picture and save as: name of person to your desktop. Then you will have them to upload.