This is a 16 by 16 asset pack called Rogue Noir. It's full of floors layoud out like this, and I quickly realized it's incomplete for a 3x3. First I thought of making a new spritesheet using https://wareya.github.io/webtyler/, but I also quickly realized my sprite sheet has those "tile variations" that I don't know how to handle.

Any ideas on how I should proceed?!

    neptuneskies Shouldn't be too hard to edit. I would just dump it in whatever art program and split it up as needed. May have to sort some pixels but hey.... them's the breaks.