Here's a terrific idea for making paper models of symmetrical structures.
Cassie Stephens: In the Art Room: Collage Paris
Here's a cool activity for making symmetrical bugs.
Splish Splash Splatter: symmetrical bugs
Here's a nice idea for creating designs using radial symmetry.
For the Love of Art: 6th Grade: Radial Name Designs
Pattern Block Plates -- Math Art Grade 2
Page Not Found - University of Idaho
Here's a page with a number of templates and directions for making paper chains. These are very cool and there must be something mathematical we can do with them!
Symmetry, part 2
Runde's Room: Math Journal Sundays
Apple Pie Symmetry SMART BOARD Game - FREE
Art Lesson Plan: Radial Design - Mandala
Here's a lesson on creating a mandala that uses understanding of radial symmetry, measurement, and fractional parts.