COOL! My idea:
Nuclear Survival
Basically, a group of players have a certain amount of time to get from where they're currently placed, to a safe area from the upcoming nuclear explosion. The nuke will be placed in random places on the map so no one will know where it could be. They can ether 1) Try and outrun it and head to the nearest island (or large building). 2) Dig underground as far as possible until they think they're safe enough. Or 3) Try and locate and disarm the bomb itself.
After the explosion happens, the surviving players that didn't get caught in the explosion will have five minutes to craft a protective suit (to shield them from the radiation) and head to a marked area where certain supplies are placed. Said supplies contain, a sword(or gun, whichever), X amount of meat/fruit, and whatever else you could decide.
The remaining players will have X amount of time to ether outlast the remaining time on the clock or kill the surviving players by ether killing them directly or sabotaging their protection from radiation.
It would be so awesome if you could make this! I would give you credit on my server and if it was good donate real money!