I didn't read through all the suggestions (way too many of them) so I'm sorry if this has been suggested, but what about a post-processing-only assignment.
The administrator can take a picture of some scene and post the snapshot like you usually do and supply the RAW file for download. People download the RAW, process it, then post their resulting images. There's no limit to the amount of filtering, clipping and general post-production work that could be done.
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