Originally Posted by George Pataka
i want new maps, not a new game
Summoner's Rift is the Perfect map for that style of game. You're not gonna get any better or worse without having to totally change balance and gameplay anyways.
That's why with Dominion they've already preemptively removed and added items plus created a global "Buff/Debuff" that applies in Dominion.
The most you can hope for is a map so similar to Summoner's Rift that it wouldn't really be worth the time. I think the 3v3 style map is the only viable option and still retain some aspects of the gameplay.