Pattern in Islamic Art
I just had to make a link here to what looks like an extraordinary resource: Pattern in Islamic Art. There are collected in one site thousands of images of Islamic decorative artwork from a variety of sources, all copyright free and available for download. You can search for architectural samples by region, illustrations and diagrams from published works, historical samples from museum collections and more. Too much to see… an incredible resource.
And that’s just from a few minutes of browsing. There are pages and pages of this stuff.
go on, take a look… but make sure you have plenty of free time on your hands.