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In general:
I don't have any particular squicks or triggers (yes, really). I'm not so keen on total fluffy no-problems curtainfic. I think that's about it?
My AO3 name is Kastaka - which might not be obvious :)
The Culture - Iain M. Banks:
Literally anything in this universe is excellent, but if you're looking for starting points: The Culture is generally portrayed as post-religion, but what would some corner of it reviving / keeping alive some Jewish festival, possibly with some hilarious misconceptions, look like? Initial Contact survey of some interesting local culture, possibly riffing off another fandom? Ordinary Culture citizens discussing any of the events of the books, skewed through whatever news feeds they prefer?
The Avengers (Marvel Movies):
I am inordinately keen on Maria Hill in the field being the action hero, or to be honest anything where she's more than just background :-). If you'd rather make something about Natasha, her backstory is full of potential for interesting (and disturbing, if that's your thing) vignettes. Or if Pepper's more your style, I'm very interested in anything about how she deals with Extremis, or her kicking ass in her own right - or maybe an AU in which _she's_ the evil vizier...
Rebecca - Daphne du Maurier:
I am mostly very fond of the style and feeling of Rebecca - the backdrops, the claustrophobia, the quiet despair. Anything that echoes these would be great! I am also very much open to fix-it fics, alternate endings, and this fandom is an exception to my general dislike of transplantation AUs - modernisation / different-circumstances retellings of parts of the story are good here.