Or maybe the people who painted them is facing something that they decided to do this to let go of some emotions by painting them on those rocks, but I think I'm just blabbing some nonsense here, lol. Whatever, these rocks looks cute, it's like they give that added touch to the Beauty of that place.
No, it is not nonsense what you say. People always try to find ways to express their thoughts and emotions, through art, writing, music or even pebbles. 😇