Special equipment: 2 piping bags or resealable plastic bags with 1 corner cut off
Cut a 4-inch circle out of the center of each cake (reserve the small cut-out cake rounds). Put 1 of the cake rings on a cake stand or serving platter and frost with about 1 cup of frosting. Put the other cake ring on top and push down slightly. Fill the hole with gummy worms and 1/2 cup crushed chocolate wafer cookie "dirt". Now cut 1 of the small cake rounds in half horizontally to make two thinner rounds. Use one to fill the hole on the top of the cake. Frost the top and sides of the cake with the remaining frosting.
Dye the coconut: Have ready resealable plastic bags or plastic containers. Add the coconut to the bag along with 20 to 25 drops of food coloring. Seal and shake vigorously until the coconut is evenly dyed. Add more food coloring, one drop at a time, as needed to get bright, vibrant colors.
Fill the piping bags or resealable bags with royal icing. Pipe small flower petals or flower outlines onto the vanilla wafer cookies with white royal icing, then pipe circles of yellow royal icing in the centers of the flowers to create daisies. Let dry thoroughly before using. Press the remaining 1 1/2 cups crushed chocolate wafer cookie "dirt" onto the sides of the cake to evenly coat. (It's alright if some of the chocolate frosting shows through.) Sprinkle the top only with the dyed coconut so that it looks like grass. Place the decorated vanilla wafer cookies on top of the cake to look like a field of flowers. Use mini marshmallows to prop some of the cookies up at a slight angle.
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