So here's my idea: every once in a while, maybe annually, we have a completion to see who can make the best game on their res. The winner would have their game become one of the official games that mods hold weekly. As fun as mob arena and Firefloor are, competition and variety are never a bad thing!
You can make an event and submit it to me at any time for approval to become official. There wouldn't really be a good way to pit them all against each other though in a contest. A lot of our current events came from player ideas.