"Canva is a new service that makes it easy to create beautiful slides, flyers, posters, infographics, and photo collages. Creating these graphics on Canva is a drag-and-drop process. Start by selecting a template then dragging and dropping into place background designs, pictures, clip art, and text boxes."
Canva is in beta but their response for an account is usually done within 3 or 4 days. Create slides, flyers, posters, infographics and more and download them or link to the online graphic. You may upload your own images or use from their collection. This looks like a quick and easy way for you or your students to create media for classes or activities that take place in your school.