This pattern is made with 4 colours, or three if desired. The spirals gradually get wider, then decrease again.
This pattern is available in US terms as well as UK/Australian terms.
Find it here: http://www.ravelry.com/patterns/library/four-tone-spiral-mandala
And here: http://www.artfire.com/ext/shop/product_view/CraftCove/9959663/four_tone_spiral_mandala_pattern/design/patterns/crochet/home_decor
