Before I explain,I'm going to reference the Source engine [Counterstrike]
For years the Source engine and its' games has served as a playground for modders. The source engine has near endless possibilities, and from what I have seen so far, minecraft is the same way - why not take advantage of this?
I am aware that the powers the players have to customize their servers are probably fairly limited considering this is a beta stage, and I am not very script-savvy nor aware of the possibilities the players have to script certain aspects of the game, but I've been on other servers where the console has done many impressive automated things that really made me start thinking of different possibilities.
Possibly a king of the hill server, or perhaps areas within servers where this could happen!
Here are my ideas! They're just ideas, remember!
A giant tower on a very symmetrical hill surrounded by a giant [and I mean giant] field.
One players stands in the tower [and has complete 360 degree vision of the field/players] and basically has a ton of different levers and buttons that do different things to the field. Examples:
-Arrow-shooting dispensers [Possibly the tower itself could be a bunch of arrow-shooting dispensers. Flaming,maybe?]
-Lava streaming out of different areas
-Flooding an area
The field itself could be littered with lava and water, home-made death pits (this can be accomplished with TNT, blocks of sand, and wooden pressure plates)
So again, one man sits in the tower and has many traps at his disposal to slow down and even kill the pursuers.
I think that once you get to the tower (which should be very hard!) the tower itself should be a maze of traps and tricks. Your goal would be getting to the top, where you might be able to do different things!
-Kill the player in the control room (Some hilarious death, like the room filling with lava, or flaming arrows shot at them)
-A chest full of awesome items.
-Become the person in the control room
-Access to the server (As in the king of the hill game would act as an "entrance" to the server, where you can build things far away after you've gotten to the top. A chest of items could also go along with this.)
-The ability to slay everyone else on the field
There are a couple things I had in mind in order to secure the fun and convenience of the "mini game":
-A reset button (Resets both the tower and the field back to 100% previous state, otherwise this idea would be a one time thing only. That or it'd be tedious.)
-Players spawn with nothing but possibly a few blocks of sand or gravel, maybe a bucket of water.
-Blocks need to be protected so players can't just dig their way under the field and use the blocks to make an air bridge to the tower. (I understand this can be accomplished with bedrock, but that's ugly.)
-The whole area needs to be protected (Either by walls, or some sort of barrier that prevents escape)
I understand this idea is probably completely far-fetched because of the scripting possibilities, but it would truly be awesome if it was possible!
There are many many other things that could be done with this type of mini game, of course. It's obviously not confined to the ideas listed above, those are just a few things off the top of my head!
Feedback/flames encouraged. Feel free to speak your mind.