Some ideas (sorry that these suggestions are admittedly rather generic - I'm not in a creative mood either) And given the basic nature of these, you might have done some of them before already, or something close. But I figure tossing them out in any case if you need some suggestions. You always have the option of not using them)
1. You might have done this before, but what about a basic future history scenario? Not based on any specific sci-fi or fantasy etc book or movie. But rather your own prediction as to how things will be, say, circa 2100 or 2150. A realistic or maybe semi-realistic (with the crackier, more sci-fi-esque ideas, if you so please) take. Admittedly, this a pretty hard one, there being no external resources to depend on and, of course, predicting the future is always an unreliable (and extremely hard to spell out) game - but that's part of the charm, maybe. And there really is nothing more original than this, I'd think. (Plus, who knows, if you do make this, maybe your predictions turn out eerily Simpsons-correct and you become like an early 21st century Nostradamus or something.)
2. Somewhat iffy about this due to the problems it has, but what about a "Baddies" world: every country the cartoonishly evil, stereotyped version of itself. It doesn't have to be strictly the OTL "evil" one: there are plenty of Nazi Germanies and Imperial Japans and British Empires-analogues enough historically, and it would feel cheap and wonky when you have, say, a surviving Black Myth-dialed-to-the-11 Spain neighboring OTL Nazi Germany, a butterfly holocaust (heh) in other words. One problem is the territorial clash - say, there's be a bit of a problem having an absolutist-and-even-more-racist British Empire right next to a fascist and expansionist USA, not to mention having these mighty surviving evil European empires probably leave little wiggle room for independent Latin American, African and Asian dystopias (I'm thinking diverse mix of nasty nationalist fascist, famine-prone communist, Islamic fundamentalist and angrily nativist-xenophobic regimes taken to their cartoonishly evil limit). So I'm not sure about this - might require more work than it's worth to get it feeling authentic. Perhaps it'll just work better as a purely ASB, "some Supreme Being Above decided to drop the worst versions of each country across the Multiverse on one planet as punishment for their follies"? I dunno.
3. "Disaster universe" mash-up: in the late 20th century, all the cataclysmicly devastating geological (and perhaps astrological) phenomena start wreaking havok on the planet. Japan sinks, California becomes it's own island, modern day Tunguska, etc. It could also be a homage to the disaster thriller genre itself, sort of like your horror movie one. The disasters are frequent and globally widespread enough that, but maybe not enough to totally destroy world civilization - damage it a great deal, but not the end, since that probably wouldn't make for much of a scenario beyond "uh oh, everyone dies!". The "twist" here there is no clear evil force or conspiracy society driving the disasters: it's just that their universe is particularly incredibly unlucky, and perhaps has somewhat different laws of nature than our own, say, to explain the ASBness of the perhaps more fantastical / broad-ranging catastrophes. Admittedly, the lack of a cohesive structural system explaining these disasters might be a negative mark on it's own, being that it might take a lot of effort to make all the separate disasters feel connected enough to be one self-contained scenario rather than just several loosely-connected ones somehow set in the same world. (And not, say, basically an abbreviated 2012-expy). Not sure if it gets points regarding "originality" since it does take from a variety of disaster genre media, though you could go with your own unique take on it.
4. Maybe a series of more maps revolving on
this idea? It's a fairly broad and open concept - not in and of itself being based on any published AH or SF work - though the problem being that it'll consequently need more effort too. It doesn't need to be itself based on any particular alphabet set or combo. It could well as be based on region, religion, ideology, bloc, etc. Say, how do the WW2 Axis, after being transported to a virgin earth, fare with each other (they have the whole world to themselves, after they beat each other up of course) Or the socialist bloc just before the Sino-Soviet split. Or modern NATO, etc. (Admittedly this might well come off as a wank-fantasy for certain prompts...)
5. Crack general idea: DBWI-type Alphabet wank series or alternate history from the perspective of an alternate universe historian. Operating and writing with the societally-widely-held social, cultural and historical assumptions and notions of that world, you theorize about other worlds. Say, it's a classical Greek/Punic Mediterranean dominated world - what do they think, of, the prospects of an enlargened Pretani/aka *British empire, that, in their world, was not much more than a coastal backwater? Or whether any Latin state could have ever unified Italy? Of course, saying that this requires a lot of work would probably be an understatement - it's hard enough making a believable and plausibally-constructed alternate world, let alone operating from the assumption of one in making another (in AH-ception). So yeah, but I'd say it'd definitely be unique content.
6. If you're not into these non-specific suggestions, I still think people would appreciate covers of established works of media just as much as original works - besides the general AH/SF mix, maybe more fantasy-ish works could work? Say a map-scenario of Westeros (there's some unexplored bits in the east and south of the planet you could make your own ideas for?), or the world of Avatar: The Last Airbender, or I dunno, Lord of the Rings, or maybe ASB mashups of these: I recall seeing a pretty map for a scenario involving Columbus' ship stumbling upon Westeros somewhere back in one of the old map threads, and that could be some fuel for scenarios. (If you're into ASB scenarios of "ISOT!", anyway)
In any case, just tossing out ideas! No need to particularly use any of these, though I'd be glad if they ever manage to help you.
