I know you are probably looking for someone on a national scale and I don't
know how widespread her reputation is, but right here in Indianapolis, we
have Lois Templeton, who does wonderful things with kids. She is a
delightful free spirit who creates expressionistic abstract works sometimes
incorporating personal poetry, etc. My eighth grade just took a very
productive field trip to the Art Center to work with her on an interactive
wall, and several of my students have now asked if we can have such a wall
in the art room (You bet we can!) She is a great resource.