Who knew upcycling could also be a de-stressing activity? The Journal of the American Medical Association found that a person's heart rate, blood pressure and skin temperatures dropped when he or she crafted. One easy way to turn trash into kid-friendly treasure is to collect empty juice and milk carton containers and paint the exteriors with craft paint. Allow the paint to dry, and let kids decorate the fronts like buildings -- with windows, doors and signage. Embellish the scene with toy cars and dolls to make your own miniature city.