Paint the center panel of each side of the box black. To make a stencil, cut a piece of the plastic folder the size of one of the box sides.
Cut leaf shapes out of the to make a template for stenciling the leaves.
Mix two parts silver paint to eight parts decorating paste. Lay the stencil on one side of the box. Tape to secure. Spread the colored paste over the stencil using a palette knife. Lift the stencil straight up.