Craft is actually a number of separate skills. You could have several Craft skills, each with its own ranks, each as a separate skill.
A Craft skill is specifically focused on creating something. If nothing is created by the endeavor, it probably falls under the heading of a Profession skill.
Let children paint. Put them where they will cause the least damage, spread newspaper on the floor, drape them in old shirts and stick around to check that they don't tramp paint about the place - but don't stop them.
The discipline that needs to be developed is that of organizing.......... the rest of your surrounding knowledge, work to make its evolving nature more visible. The tools make that more manageable. All that remains is for you to believe that it's worth doing.