Prepare icing according to the recipe. Spoon the icing in a ring over the top of the King Cake and allow it to slowly drip down the sides.
To decorate for Mardi Gras, sprinkle wide stripes of purple, green, and yellow colored sugar crystals.
If using food coloring, whisk together icing per recipe. Divide icing evenly amongst 3 bowls. Add 2 drops each of red and blue food coloring to the first bowl to make purple. Use 2 drops each of yellow and green in the remaining 2 bowls. Scrape each individual bowl into its own ziptop bag. Squeeze out all the air and seal. Snip off one corner of the bag and use as a pastry bag to pipe wide stripes of icing on the King Cake. The bags will give you more control than using a spoon or spatula. The icing should firm up a bit in about an hour.
More About Mardi Gras• Easy Mardi Gras King Cake Recipe (standard form full recipe)
• All About Mardi Gras
• Cajun / Creole Recipes
Easy King Cake Recipe Photo © 2009 Peggy Trowbridge Filippone, licensed to About.com, Inc.