A mosaic design in art is the composition of a large imagine using small pieces of various materials. These small pieces are often irregularly shaped, but when they are pieced together in a large enough image, they add texture and color to the final product. A coloring book featuring mosaic design is ideal for teens and older children as it is more complicated than a regular cartoon book, and at the end, after all of the spaces are filled, the result is quite complex and lovely!