Attribution for these astonishing works has been lost in the compilation process. First, international currency symbols by Diem Chau. Second, crayons carved into the 12 symbols of the Chinese zodiac, also by Diem Chau.
This picture shows contrast because it has light and dark colors. The backgrounds the darkest colors and the crayons are the lighter colors. You can focus more on the crayons because of the bright colors that they display.