Maybe a cyclorama type background? I think just about everyone has a cyclorama?
If not, some sort of a polygon amphetheather/backdrop to hold an image can be easily modelled...

I suppose someone can set up a scene, and then render a series of images to put into a cyclorama for other participants to use?

Everyone is welcome!

Yea, making caricatures of others can be a lot of fun too :D

Hi, my namez: "NO, Bad Kitteh, NO!"  Whaz yurs?
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