National Council of Teachers of Mathematics
The Math Forum: Making Patterns
Explore the literature connections, online activity, pencil and paper activity, and the manipulative investigation of patterns and geometric shapes on this page!
Books in the Classroom
Carol Hurst's Children's Literature Site: Patterns and Picture Books
CarolHurst.com provides a sample chapter from Picturing Math, which teaches geometric concepts using picture books and activities.
Other
Artlandia: Pattern Design Tool
If it's in the budget you may want to consider purchasing Artlandia SymmetryWorks, a plug-in for Adobe Illustrator. There are two features that incorporate the use of computer technology to create symmetrical patterns. Free seamless...