I guess I see water based hybrid acrylic paints and markers made from plant oils and resins, plant dyes and natural binders with no ammonia or formaldehyde as pretty good alternatives to the list of heavy metals and other toxic ingredients in the acrylic, varnish and oil based paints your Columbia article listed as hazardous waste....which they are. For a young cousin's art projects I've bought very earth friendly paint products at art supply stores....the same child safe markers that it looks like Nocket used.