Problem solved already!

Okay, upon a little more exploration, I found the Identities option within VoiceThread--It is perfect for teachers, as within your account, you can create an unlimited number of "identities" and upload a different picture for each one. You can even use a class photo, and zoom in on each particular student to have their image cropped and made into their avatar. To teach them a bit about online safety, I might start out the year by having them create an art piece that represents them in some way, scan or photograph and upload those, and use those as avatars for these various on-line technologies, so if their creations are posted widely, their faces don't actually appear. I think it is important to remember and teach good online safety as we move into these technologies. I am very eager to get together with some teachers and create something with this!