Oh how bizarre! They were image URLs from public FurAffinity submissions. 🤔
But of course! You can check them out among some more examples from these folders:
Pagedolls: https://www.furaffinity.net/gallery/otterqueen/folder/860661/Small-Art (ten most recent posts)
Sketches: https://www.furaffinity.net/gallery/otterqueen/folder/352890/Sketches (full bodies)

If for whatever reason those links don't work, then the folders can be found in my FA gallery - same name as I use over here (OtterQueen)!