A few odd little activities you could use online for warming up a group
[And help with identity creation]
Words > Graphics
From the site: "Wordle is a toy for generating “word clouds” from text that you provide. The clouds give greater prominence to words that appear more frequently in the source text. You can tweak your clouds with different fonts, layouts, and color schemes. The images you create with Wordle are yours to use however you like. You can print them out, or save them to the Wordle gallery to share with your friends"
Petitions. (An off the wall idea)
Warning I do not endorse these apps for any particular setting, use at your own risk (to people's equilibrium, peace of mind or ability to engage in your online event) Scaffolding and care needed.