Arabic art or Islamic mainly represent geometric shapes or arc designs. Living beings like Humans, Animal or Plants are not included in Arabic Art form. Islamic art is not at all restricted to religious art, but includes all the art of the rich and varied cultures of Islamic societies as well. It frequently includes secular elements and elements that are frowned upon, if not forbidden, by some Islamic theologians. Calligraphy, Painting, Weaving, Ceramic Painting, Mehndi (tattoo) are Arabic Art forms (refer Islamic Art )
It can be observed the fine line and strokes are enhanced form of calligraphy. The colors used in Islamic art form are shades of green, blue, black, yellow etc.
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http://www.colourlovers.com/blog/2007/09/08/colors-of-religion-islam