Nathan Sawaya chooses to build his awe-inspiring art out of toy building blocks. LEGOŽ bricks to be exact.
This is an interactive lesson Wiki - a launch pad to a range of materials on some common topics and literacy areas (eg biography)
Seasonal Arts and Crafts for Kids: Holiday Crafts and Special Days
M.C. Escher (1898-1972) was a Dutch illustrator known for his optical illusions, tessellated repeating patterns, and intricately detailed black-and-white images illustrating mathematical principals.
First thing you'll probably notice, is that this site is in Dutch.