I saw this out of the corner of my eye and had to back up to make sure what I was seeing. Yup, contact paper that looks like a brick wall. I agree with the idea; this is better than a grey metal box, especially for a spot you see near-daily—plus this is a big utility box!
This stump is losing its battle with the fungi. Their function in the wild is as part of the army of living things that breaks down dead things. I’m no specialist, but I counted five visually different fungi in the process of turning this oak into dust.