The National Gallery of Art’s NGAKids site is a playground of online interactive art activities. Make a collage, a still life, a Rousseau-esque jungle scene, abstract art. It’s all here. Another great feature is the Adventures in Art. These are kid-friendly interactive studies of some of the most famous pieces in the Gallery. This is a great way to add some art study to any unit you’re working on. Good for all ages and free.