See here for a brief introduction to the Gateau Method.
If we were just throwing together random ideas, then of course, we could be a little more flexible with our choice of genre; it could be space opera, high fantasy or whatever. However, our source material in this case—Wikipedia—pretty much guarantees an alternate history setting. Given the US-centricity of Wikipedia (and most readers’ familiarity with America), it’ll probably be focused the USA, or at least something that bears passing familiarity to it.
So, without further ado, first up on our list of topics is Marree Man, a massive geoglyph in the South Australian desert, reminiscent of the Cerne Abbas giant, the Uffington White Horse or the Nazca Lines, only much, much larger and more recent in origin.
Ever since Erich von Däniken’s Chariots of the Gods?, the Nazca Lines and other geoglyphs have been associated with attempts to communicate with extraterrestrials. But what if such geoglyphs were instead used to communicate with aliens inside the Earth? What if they were, in fact, gigantic goetic seals used to summon the inhabitants of K’n-yan (or Shaver’s Deros) to the surface?
As you can see, I’m riffing pretty loosely here. With such a diverse range of topics, it’s essential to free-associate; otherwise, we’ll get too caught up in specifics to easily be able to slot topics in later.