I have read this happens often when painting in colder climes, too many sneezes while applying the paint, causes that interesting 'splatter' effect. The various colors are caused by inadvertent switching between color selections during the sneeze. Of course it was cheaper to leave the results as were rather than re-paint the whole thing. One of those 'I meant to do that.' Or I could be full of it and someone just let Jan loose with crayons as suggested earlier!
Yes, it would have to be crayons.
Paint brushes have a metal ferrule at one end, and a pointed shaft, which could be potentially dangerous, and Jan isn't allowed to have sharp objects .............