Has anyone ever found a painted rock while out and about?

I came home from a weekend away to find that the big tree in front of my house fell and took out my dock.
Near the hole where the tree once stood was a rock with a tree painted on it.
I told my brother about it and he said that while walking a pebble strewn beach, he happened to look down and saw a pebble with the words “Turn me over” written on it.
The underside said, “Thanks!”
Ever find one of these rocks?