Put a portion of the red cake plugs back into the bottoms of the red cake circles. Pipe a line of frosting around the centers of the red and white cake circles. Stack the white cakes on top of the red cakes, and the blue cakes on top of the white cakes.
Add Pop Rocks down the hollow centers of the stacked cakes. Put a portion of the blue cake plugs back into the tops, covering the center filled with Pop Rocks.
Cut licorice rope pieces approximately 1-1/2 inches long, and insert them into the centers of the blue cakes.
Note: For maximum popping potential, pour the Pop Rocks into the cake centers no earlier than one hour before serving. The moisture in the cakes will cause the Pop Rocks to slightly snap and crackle on their own. In fact, they make a great sizzling sound on the plate. But after about four hours, the Pop Rocks lose most of their popping power, so plan accordingly.
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