I'm working on something for ACKS I think would qualify as Sword & Sandal, although it has very different influences.
"Know, oh prince, that between the years when the sons of Adam fought and the rains flooded all things there was an Age undreamed of..."The core idea is adventures between Cain killing Abel and the Flood (Genesis 4:17 to 6:
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Instead of classic D&D races we have three "Generations of" (echoing the language of the above parts of Genesis):
1. Generations of Seth - Humans who are descending to some degree from Adam's third son. They are clerics, fighters, and paladins, but not wizards or thieves.
2. Generations of Cain - Humans who are descending to some degree from Cain. They can be any normal human class except clerics and paladins.
3. Generations of Lilith - The "elves" who are wizards, warriors, and witches.
4. Men of Renown - "when the sons of God came in unto the daughters of men, and they bare children to them, the same became mighty men which were of old, men of renown." The children of angels (divine and fallen) and human women.
I'll probably build 1, 3, and 4 out using ACKS race construction (although elves and nobrians could fit #3 and #4).
Everything is set around a shrunken Black Sea using the Black Sea Deluge hypothesis as the future Flood.
To provide some kind of ruins and (maybe) explanations of where the people Cain met came from I'm borrowing a page from Ken Hite's
GURPS Cabal and assuming Genesis 1 and Genesis 2 are not parallel accounts, but accounts of two different creations. The demons (as opposed to devils, an idea I used about a decade and a half ago in a world set in the aftermath of The Apocalypse as described in James Blish's
Black Easter and
The Day After Judgement) are chaotic beings out to destroy the current creation, some of which may be leftover inhabitants of the prior creation (qilip in Hite's book).
Don't have much more than that as I only came up with the idea back in October (maybe late September), but have at least one interested player so need to get off my butt and flesh it out.