My friend sent me this website http://www.artsonia.com/ where children's art pieces are showcased there.
There are schools from all over the world. It's really something. Can't imaging children as young as kindergarten can draw and sculpture so well. Anyone can contribute. Try uploading your kid's artwork. I'm sure they will be very proud to have their art piece exhibited.
My dream for Jonathan...one day....I will ask him to draw something for me and I can showcase it too.