What kind of claim tables would you use? Colors, food, hurt/comfort, etc.? A mix of all? Would you require a firm number of claims, like 50 or 100? Would you allow flexibility as to the number (with, say, 10 as a minimum)? And would custom tables be allowed? Would your rules be very general, specific, few or numerous? Would your comm be all fic or include art/graphics and other fanworks? What other elements would you add?
Put on your mod cap and see what you can create! :)