iPiccy is a free photo editing site, no registration required. Just upload your photos, and then you can edit them in a variety of ways, add fun effects, and create collages.
The site is pretty easy to use. Here are two screenshots that may help you along. But if you need more help, send me a message on Edmodo and/or we can have some tutorial time in class.
Keep adding photos to your Summer Notebook pages! You can easily add your photos and collages to Flickr or Facebook, too.