Just have students sign up for it and create. Or if you want to have a class gallery, you can sign up for it yourself and put student work on it. There are others out there that you can use, also, as well as many other free tools to use. Just be sure that if you show images of your students that you have parental permission forms signed and on file. Here's a link to a sample Weebly class gallery of work.
I'll post others here as you send me suggestions or I discover more.
Craig Roland, professor at University of Florida in Gainesville often writes wonderful reviews about different digital tools. His blog is the best place to go to find out what's out there that art teachers might be interested in. Here's a link to his blog, The Art Teacher's Guide to the Internet.
