Hmm now I have to think and you know me and my thinking process :)
1 = A mod that allows users to go to say Christmas Island to do their shopping, this would take 3 days to complete the journey and on the way users can be attacked by NPC's within the game to steal money from them, Those people who have entered to join the journey cannot be attacked by regular players are the are not within the vicinity for them to attack, However those that have joined the journey can attack one an other to steal cash from them.... After the journey has ended and all players have reached Christmas Island New shops will appear with various goodies to buy....
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2 = Snowballs that can be thrown at players which will either not harm them or they could be knocked out and sent to hospital