I want Steve's stage in Ultimate to be a salt mine
.
I know that you are joking, but please not that.
I want it to be a morphing stage in some regards: each time you play the terrain changes, and maybe in matches with time limit some stuff could happen during the battle that changes the form of the fighting zone (some players taking terrain bricks, using TNT, or even Creepers blowing apart while taking part of the stage with them).
Maybe from time to time a NPC could appear, and it starts building a lot of things in the middle of the fight.
If it was just a static place, i would be dissapointed... Because a Minecraft stage has the potential to be fun and wacky,