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...