WAVE is not your average coloring book. Once opened, it unfolds into a nine-foot-long panel, featuring a continuous and dream-like illustration by rock star contemporary artist Shantell Martin.   And this unique book also provides a blank canvas: After you add your splash of color, use the reverse side to create your own unfolding illustration, for a final product that's both inspired and inspiring.   WAVE will bring the art gallery to your living room, a perfect display piece and an opportunity for daring colorists to transform a piece of art in a whole new way.