painted utility boxes

Some of them look nice, some are not, but as far as i know if i dont see an artist signature, then it could be graffitti that was illegally created for thecpurposes of getting a waypoint near a private residence. What is the rule or clarification for this? because ive been skipping. Thoughts?
Comments
Would you paint it over or does it look good in your eyes? Thats the question I use for reviewing. They dont need to have a known artist. If they are visually unique, they are alright as a great place for exploration