Crumble the baked cake into a large mixing bowl. Add white frosting and mix until a dough-like consistency forms.
Roll the mixture into evenly sized balls and place them on a parchment-lined tray.
Melt a small amount of dark chocolate candy melts. Dip the tip of each cake pop stick into the melted chocolate, then insert it into each cake ball.
Chill the cake pops in the freezer for 15 minutes to firm up.
Melt the remaining dark chocolate in a microwave-safe bowl, stirring until smooth. Dip each cake pop into the chocolate, ensuring even coverage.
Press the top of each cake pop onto parchment paper to create a flat surface, resembling the top of a cauldron.
Once the chocolate is set, pipe a small mound of yellow decorating icing on top of each pop.
Attach a piece of rainbow candy to the icing and sprinkle gold candy pearls on top to create the "pot of gold" effect.
Let the decorations set before serving.