Photovisi is a site that allows you to upload several photos to create a collage of photos. The site is fairly simple to use. Select a template, upload your photos, then download the collage in jpeg format. There are several different templates to choose from as well, and if you create an account you get access to all the templates. Each template can be edited to organize the pictures in a way that best suits your needs. You can change the background color or even put an image in the background of the template. You can also crop the photos once you upload them. The upload features was also rather fast. I was surprised. Photos can be re-sized, turned, and warped as well.
You could use Photovisi as a way to organize many photos for a presentation, or even take pictures of your students and then have that as the background on your computer (if you edit the photo, you can put their name on the picture as well.). Would be a great tool for yearbook or journalism teachers as well for organizing photos of several students at one event. Great for adding photos to a classroom or school web page as well.