You'll probably be interested in this guy, who does graph coloring problems for 7 year old kids. He even has coloring books: http://jdh.hamkins.org/math-for-s

You'll probably be interested in this guy, who does graph coloring problems for 7 year old kids. He even has coloring books: http://jdh.hamkins.org/math-for-seven-year-olds-graph-coloring-chromatic-numbers-eulerian-paths/ http://jdh.hamkins.org/math-for-seven-year-olds-graph-colori...