What we're looking at: We have an upside down bucket taking up much of the frame, but there's also a gardening cultivator. Atop the bucket is an indiscernible scrap of paper with an image that slightly resembles a map. (I zoomed in quite a bit.)
What it may mean: I was instantly ready to dismiss this image, but it looks like there are some seeds or oats atop this bucket. They could be flower seeds, especially with that garden cultivator lying nearby. Flashes of Carol saying "look at the flowers" are coming to mind.
Carol is an interesting character lately. Remember, she's off pretending to live her own solitary life in a cozy cottage. She doesn't want anything to do with anyone and she recently saw a bunch of zombies as living people. Despite her lovely conversation with King Ezekiel, Carol's been cracking lately. If you're not worried for her, you should be.
Couldn't you see her tending to her garden, pretending everything's okay again? Then again, a garden could easily represent the Kingdom's lush gardens.