This is a really helpful pdf from the Metropolitan Museum of Art on Islamic Art and Geometric design. It gives an introduction to the history, some reference images from their collection and pattern making activities. The link will download the pdf to your computer so check your download folder.
Essentially developed as a teachers resource the activities and images will help you understand the artistic and cultural concepts behind this artform.
You may find these images inspiring and the reference section may be useful for your project.
Here’s a few more links as reference and inspiration:
1. Metropolitan Museum of Art – Islamic Art Slideshow
2. Pattern in Islamic Art – over 4000 free download images and details of design features showcasing this intricate artform