Picozu is a free online image editing tool. Using Picozu you can touch-up existing images or you can create new images from scratch. In the Picozu editor you will find tools for adjusting color saturation and clarity. The editor also includes tools for creating images containing multiple layers. And if you want to include text in your image Picozu has options for that too.
Picozu offers the option to register and join their community or you can use the editing tools without creating an account. If you do choose to create an account you can save your images on Picozu and add them to the community albums. If choose not to create a Picozu you can save your images to your computer, send them to your Facebook account, or send them to your Dropbox account.
Applications for Education
If you're looking for a nice tool for students to use to create images for their digital presentations, Picozu is worth giving a good look.