I have a couple of ideas:
RoundUp Match: Takes place inside a cage simialr looking to the elimination chamber with 4 pods, all 6 competitors start out, to eliminate an opponent you have to throw him into a pod and lock it, when its down to 2 its your standard pinfall/submission, or, there could be no cage and instead there's a small plexiglass cage up near the ramp, to eliminate an opponent your put him in the cage and lock it, but to eliminate mor eopponents you have to unlock the cage, and throw them in aswell, so you risk getting a beatdown by a fresher opponent. The match ends when 5 opponents are in the cage.
Bell Tower match, triple cage with the top cage having a bell in it and no doo, just an opening. to win ring the bell. any number of wrestlers can compete in this.
Get out of Dodge match: think of this as the old hardcore title 24/7 rule, basically, to have control of the tile you have to literally leave town with it, and to add to the gimmick they could keep checking back on things in between matches during a PPV, going as far as car chases etc.
Damsel in Distress match: triple cage match between 2 tag teams, one of the teams has put up their female valet vs. the tiles, the valet stands in the top cage. to win you have to climb to the top cage and release her, if the challengers win they are the new champs and keep their valet, if the champs win, they keep the titles and now have the valet for X number of days.