No, you won't find rock painting in any craft books. Here's the step-by-step. Are you ready, you may want to write this down.
(1) Find a rock.
(2) Paint it.
Here's the point -- we had a problem. Any tablecloths we use on the cockpit table end up blowing off or even worse blowing away all together. It's true, the local knickknack store sells a package of widgits that handily solve this problem. But that involves a trip to the knickknack store to look for said widgits resulting in an afternoon spent shopping with a 5 year old which is like - well -- shopping with a 5 year old, and then spending money you don't have on something you do need that's mass produced and now YOU are part of the problem.
Instead, we shifted our thinking. How can we solve this problem, for free, in the fresh air, being creative, and engaging the boy so that the mama can also get her chores done and have a moment of quiet.
Of course rock painting can easily morph into arm painting and leg painting and hair painting and solar panel paining if you're not careful (which I wasn't, but it's bath season and a spray bottle of vinegar and water around the boat can work wonders).
But now we have a lovely, child made, colorful, natural, stone age solution to our problem.