holy shit you just reminded me of that completely ludicrous HL2 mod. It was called something like "cinematic mod" and the guy who made it upped the texture resolution (it looked pretty bad), fiddled with lighting (also in a bad way), remade some levels (aaand we're three in the hole for bad) then spent the rest of his effort replacing all female characters' models with ones that have huge boobs and skimpy outfits, it was hilarious.

And apparently some people dug into the files and the Alyx model even had a fully modeled cervix for whatever reason