Try the Make a Drawing page with a sophisticated and easy to use paint program. Children can see colors being added to their palette and how they mix, and they can choose settings for the transparency and size of their pen.
On the Make a Picture page, children select different backgrounds to start with and then they get to add elements to create their art in a collage style. I happened to find a couple of pages base on famous paintings. As elements are selected, facts are given about the artist and his work.
I hope you get a chance to play at Kerpoof!