(... who thinks I've somehow locked down or 'finished' the history and extended canon of the PPC - however jokingly they say it, Ekyl)
The only reason there was an 'all the good stuff' for me to write is because I (and Vemi, and Starwind) created it. Before I wrote the original Origins, the only statement on the reason for the Flowers was that 'we replaced all the human directors long ago' (which is now retconned as a joke). Before I wrote The Reorganisation, the SO had ruled uninterrupted since the PPC was founded - and still did, because the Board of Flowers was my invention, too.
But hey, that stuff is all written now - so what's left to do? Well, here's what I could come up with in twenty minutes of idle speculation:
-The history of the Garden. Ekyl dismisses it as 'the Origins side stories', but there's enough content there for a trilogy of novels if you wanted. I deliberately wrote as little as possible about civilians on Origin. The tensions between Works and Garden, their reaction to the increasing industrialisation of the Hill and the dangerous technology they're playing with, the entire Civil War, life on Origin after the war, the final collapse in the Cascade... there is endless scope there, and I barely touched it. Ekyl, all of your ideas are still perfectly valid - deliberately so.
-The ten-year-ish period between the Fall of Origin and Lofty Skies. This is the formative years of the PPC, when they go from 'mundicidal Flowers and Korean tech support' to 'trios of agents hunting down rogue plotholes on the ground'. There are heaps of stories to tell there - and the only things written in that time period are a handful of backstories. If someone wants to do this, I'm even willing to rent out those of my agents who were around then - Nyx and Dassie, looks like.
-The formation of the DIS. There's half a year or so between the Mysterious Somebody assuming power and the DIS being formed. How did he find an excuse to create a secret police? Was there rebellion against his rule? Did he invent a rebellion in order to continue his plans? If so, did it come true for real when the DIS was created? For that matter, what was the DIS originally like? Dassie says they used to be not that bad - why did they shift? Again, it's completely untouched.
-The early history of the Mary-Sue Factory and BioInc. Flowers from the PPC, with their utter terror of rogue plotholes, were somehow persuaded to build a factory to create them. How did that happen? I bet it didn't go smoothly. No-one who knew about the Factory made it back to HQ to spread the word - but we already know the DIS was willing to take out anyone who tried.
-The formation of the League. Reorg claims there's only one Factory, but by the end of Crashing Down, there's an entire chain of them. Did the MS found them? He doesn't seem to call on them. Did some of his Flowers split off? How did that go? How did they interact with the PPC?
And that assumes you're only interested in the big, sweeping histories. I've also expanded massively on the DRD and RDR - but there are other departments with equally little written about them (SIELU? The DMFF? Despatch?) I've written numerous interludes about various Flowers - but nowhere near all of them, and there's vastly more to say. I have a list of Infrastructure Departments first described by me as long as my arm, always including the DoDAEG - but are there really no essential functions of HQ left untouched? I have Playscriptes which introduced the concept of six-dimensional HQ - but very few stories have really played with that. I have a webcomic, but no-one has yet created any movies of anything PPC-related (barring my 'let's make HQ in Minecraft' video). Most recently, I've invented mission pins - and used them in a mission - and the Sprout movement; there's nothing to stop anyone else doing random things of the same kind. My next minor project is called 'Ephemerals', and will build on the Wrecked Music Department to look at some of our defunct departments, including some which have never been named before.
There is so much to write, folks. Anyone who thinks I - or anyone else - has done it all is missing a multiverse of opportunity.
hS