The way to get the green for Green Bay Packers, is you take a color called golden yellow and mix it into half of your white buttercream. Then take the other half, add a lot of black color and mix well. Use these two separate colors and when everyone asks you what is wrong with your colors on the cake, explain to them that you made the cake in honor of the better team. Hehe, just kidding.....(I couldn't let that pass!)....signed, "bleeds black and gold"