Glogster allows you or your students to create a digital poster using your pictures and videos. You have to join, but it's free. It has lots of fun layouts and themes to customize your posters (e.g. stickers and animations). You could use a Glogster poster on your wiki. Students can create glogsters to demonstrate knowledge of content.
This website was shared by Carmon Molnar, Technology Integration Coach. Go to www.glogster.com.