Weigh the soap and cut it into cubes with a sharp knife - there will be lines on the block of soap that you can use as a guide.
Add 2 cubes of the clear soap base to one microwave-safe container. Melt in 30-second intervals, stirring after each until it is completely melted.
Add 2 drops of gingerbread-scented oil, a pinch of glitter, and 1-2 drops of red coloring to the melted soap. Thoroughly stir the soap mixture to combine. If the color is not red enough, add a tiny amount more and stir to the desired shade.
Spray inside 6 of the round soap mold cavities with rubbing alcohol, then carefully pour the red soap mixture into them until it reaches the top. Spray with alcohol to remove bubbles. Allow to harden completely, or about an hour.
When hardened, gently pop the soap balls from the mold and set them aside.
Add the remaining soap cubes to a microwave-safe container. Melt in 30-second intervals, stirring after each until it is completely melted.
Add 1-2 teaspoons of brown mica soap colorant and 1 teaspoon of gingerbread scent to the melted soap and stir well to combine. Add more colorant and scent if required.
Spray the poop mold with rubbing alcohol and add one red soap ball to each cavity of the poop mold. You will see each soap ball has a flat end. You want to place the balls into the mold, rounded side down.
Spray the red soap balls with rubbing alcohol. This helps the soap ball and brown soap to adhere to one another. Carefully add the brown soap mixture into the mold until it reaches the top. Spray with alcohol to remove bubbles.
Leave the soaps to harden overnight.
Carefully remove the soap from the mold. Place in a gift box or bag to give as a gift or store in an airtight container until ready to use.