Then fill both cavities with melted chocolate in the color of your choice. Make sure the chocolate is cool to the touch. If it is too warm, it will melt your colored accents and they will run and smear. And then you will cry, and have to start all over again.
Edited to clarify: The above mold is the 2 pieces of the box. One side is the top, and the other side is the bottom part of the box with the cavity for the candies already in there. When you unmold it, the 2 pieces come out as you see in the finished product. I apologize for not getting a photo of the bottom part of the mold empty.