The National Gallery of Art website and app have tons of activities for creating interactive art online. The student can create a still life that emulates the old masters, or an abstract paint brush image, or a jungle landscape, to name a few. There are 15 different activities for young artists as well as news on what’s happening at the NGA.
The section for Educators has lessons plans and activities for K-12 students. The website version requires Shockwave to run. The app version of NGA Kids Art Zone is available for iPad. And you can borrow a CD versions from the National Gallery of Art, with more interactives, from their Learning Resources portal.