As a classroom teacher, art was always a struggle for me. As I was looking through our curriculum guide, I noticed one of the national art standards asks students to "Understand and apply media, technique and processes. This site allows kids to create collages using different shapes and layering. There are size, transparency, flip and turn functions. Printing is an option. This would be fun as station activity.
This appealing site offers an interactive online art zone for projects in painting, photography and collage. Exploration games guide observations of masterpieces in painting and sculpture. Link to NGA exhibitions.