I need to make royal blue and gold icing ...(buttercream)...how do i do this?....thanks Ronda

ANTIQUE GOLD Add just an extremely small touch of Leaf Green to Golden Yellow

MARIGOLD Lemon Yellow and Orange

WARM GOLD Use Golden Yellow with just a touch of brown.

i haven't found anything on making royal blue, but wilton does sell royal blue icing color.

in case you need other colors:
http://www.sugarcraft.com/catalog/coloring/colormixingchart.htm
http://www.ladycakes.com/Charts/color_mixing.htm
http://www.candylandcrafts.com/colorchart.htm

thanks for the info...I got my icing the right color...I added 1 small bottle of the liquid blue food coloring...a small amount of black and a small
amount of violet let it set for 3 days and it was the perfect color...maybe this will help someone else....