When my brother turned 18, i wanted to make him a cake for the special number. I baked a 13 x 9 cake and cut out the numbers. I frosted it all white, and dyed my own black and red icing. Using the # 16 star tip, i filled in red and black diagonals, for the white i used a # 12 tip to make circles. Add some sprinkles and candles and VOILA!