I found them in one of my (many) folders, but I can't for the life of me find where I got them from. I feel like I've seen them somewhere, but I already looked at MTS and GOS without luck. Does anyone know?

Book covers on books pulled from bookshelves?

The textures are possibly from Decat, if that helps any
https://decatsims2.blogspot.com/2016/

Looked through several defaults I've got stashed away, but none look like they use these recolors.

Thank you! That's a start, but these are defaults and I know I haven't made them (I downloaded them not too long ago, and I'm working on my own default of books). Seeing how decat didn't link to any upload, perhaps it is theirs? Sorry to bother you @decat, do you perhaps know who the creator is?

Do you have the name of the default file? Could be helpful.

I'm almost sure I've seen this one, likely even downloaded it, but without the filename it's half guessing, half random searching.

Of course! I'm not sure if I've edited them, to remove symbols etc:

DEFAULTChildrenBookCoverReplacementsBigfoot.package
DEFAULTCookingBookCoverReplacementsSalad.package
DEFAULTDramaBookCoverReplacementsGun.package
DEFAULTFantasyBookCoverReplacementsWerewolf.package
DEFAULTLeisureBookCoverReplacementsStillArt.package
DEFAULTMysteryBookCoverReplacementsKnife.package
DEFAULTReferenceBookCoverReplacementsFlowers.package
DEFAULTRewardBookCoverReplacementsDade.package
DEFAULTRomanceBookCoverReplacementsEmilyLyra.package