We did ours with the six little sauce cups that were provided and made a circular pattern with them. Then in the middle we put cubed tropical fruit (papaya, mango, pineapple etc.) in the middle for color and underneath was the traditional green lettuce. Placed 8th overall out of 38 or so.
Just make sure it is clearly stated that it is open garnish rules..
Best advice I can give is be creative, whatever that may mean to you.. You'll be more proud of that than taking one of our ideas exactly as written.
Good luck, take pics and post em after the contest !!!
Lonestar 24" Vertical offset w/ Insulated Firebox & Performer Platinum
Former owner: Jambo Backyard, Klose BYC, Med. Spicewine, Pitts & Spitts, XL & (2) Med. BGE's, 22" WSM & (2) 18" WSM's, 18" & 22" Weber Kettles