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Bed of green kale is what I typically see. Imparts no flavor (thus why I hate eating the stuff), it won't crush under the weight of the meat, and makes for a nice presentation.
Lots of good ideas here. What you can use will mostly depend on who is running the competition. There should be a 'cooks meeting' to give the competitors all the rules and answer any questions. I know this doesn't help you come prepared or practice though. Good luck and let us know how it turns out! Mike