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Platonic Realms: The Mathematical Art of m.c. Escher
Math Academy Online presents a great M.C. Escher (1898-1972 CE) site for connecting the arts and mathematics. As even Escher said, "For me it remains an open question whether [this work] pertains to the realm of mathematics or to that of...
Crayola
Crayola: Counting 'Til the Pigs Come Home (Lesson Plan)
A fun lesson plan for younger students incorporating art, math, and writing. Student create their own counting stories, and illustrate them. Also provides resources and adaptations. (To access this lesson plan, you must register with...
Crayola
Crayola: Exploring Triangles.
Here's a great geometry activity to display students' knowledge of the different types of triangles. Provides resources and adaptations to supplement this instructional activity. (To access this lesson plan, you must register with...
University of California
University of California: Art, Geometry and Abstract Sculpture
This resource gives many examples of how math and geometry are used by visual artists to create abstract sculpures.