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?!