Museum With No Frontier is an online museum of Islamic art offering a wide range of virtual exhibitions and art collections gathered from around the Islamic world, as well as countries that witnessed an Islamic influence.
You can also find books -available in different languages- about Islamic art and design, and even Islamic art e-cards. Such an interesting site!

You can browse the art work by theme or country; you also have the option to browse in English, French, Spanish or Arabic, which I find actually impressive!

[Source: MWNF]