@CV I can't find my original post, but the original idea for Mutants (Multi-team Infection) was to have four different teams that have different traits. The different traits can be accomplished through normal power up spawns or through trait zones. All players on each team spawn with Energy Swords, but there are different weapons and armor abilities within each spawn base (which cannot be broken into; they are the only places where weapon-pickup is allowed). Red team has damage boost, Promethean Vision, Shotguns, and SAWs (humans); blue team has Speed Boost, Camo AA, and Railguns (Hunters from Crysis); green team has Overshield, Hardlight, Concussion Rifles, and Gravity Hammers (typical juggernaut), and yellow team has good Camo, Thruster, low gravity, and no additional weapon (typical matchmaking Flood)
It's all based on a King of the Hill game type; make sure to exclude the spawning bases from the hill but spawn the Hill a bit late--it should include almost the entire map. When a player dies, he must join the team that killed him. The game ends when everyone is on the same team.
This all relies on the honor rule, something that I find isn't followed as much as I would like. But if you have a good lobby, then it should be a blast. I would have it on my fileshare if my Xbox weren't screwed up as well. I'm envious of everyone who can play the game right now--especially because we just got Forge Island! Gah!! Perhaps some people will get enjoyment from this game type, though it has to be tweaked a lot. Feel free to mess around with the amount of teams and the traits, and have fun!