Okay - 2 questions - 2 different cakes

1 - I am making a Harley cupcake tower like the picture. I am wondering how to get such an intense silver metallic?

2 - I am going to use the perioette (sp?) cookies from pepperidge farm to surround a round cake and fill the top with fresh raspberries. I would like to add a "ribbon" or tie around it. What would you suggest?