Interactive idea! Have kids make their own tinfoil portraits/sculptures. Great after a tour of bronzes!
Art Projects for Kids: A tessellation is a collection of shapes that fill a paper with no overlaps and no gaps. Template included.
Op Art and the Elements of Art - Expressive Monkey - TeachersPayTeachers.com
Fru Billedkunst - glimt fra min billedkunstundervisning: Op art
A fun step-by-step art lesson demonstrating how to create colorful abstract art using watercolors, watercolor pencils, and masking fluid! http://www.art-is-fun.com/watercolor-pencil-art-lesson.html