You could adapt that for the christmas season too. Instead of turning into a pumpkin you turn into a snowperson, and it is 'caught' by having any player throw a snowball at you (which could be crafted or bought!) and cured by crafting or buying and subsequently drinking a warm cocoa!
I don't know how hard this kind of thing would be to implement but I feel like it'd be great for getting the community to interact more during holiday seasons?




