I'm making some cookies for a friend's bridesmaid party. She's picked my chocolate chocolate chip cookies which I top with a white chocolate icing.   She wants the icing to be "malibu blue" and coloring my icing is not one of my strong points. I told her I'll try.   So I'm looking for advice on how to get the color with white chocolate icing, or I'm thinking I may be better off with a royal icing tinted malibu blue.   any ideas on how to match the color? any...