hi there..

http://www.patterninislamicart.com/
http://www.tilingsearch.org/

good books would be

The world of patterns
http://books.google.com/books?isbn=9810246196

376 Decorative Allover Patterns from Historic Tilework and Textiles
http://books.google.com/books?isbn=0486261468

Tilings and Patterns
http://books.google.com/books?isbn=0486469816

and you might want to check archive.org for some ornamental goodies

http://archive.org/search.php?query=subject%3A%22Decoration%20and%20ornament%22


cheers,
marco