Quoted from CraZ4Pin:we've pretty much beaten to death every original pinball design/layout given the current pinball elements people believe are required (pop bumpers, outlanes, at least 2 flippers, etc). All the crazy LED's, LCD, and bling don't change the fundamental game objectives and skill required.
I equate pinball to golf in a lot of ways. Every golf course, has 18 holes, greens, fairways, tee-boxes, rough, water hazards, sand traps, etc. Yet every golf course is different, fun and unique in its own way.
To paraphrase Jack Sparrow, Its not just flippers, outlanes, and a ball. That's what a pinball needs. What a pinball really is, is freedom.