Decorate cupcakes. Prepare decorating bag with tip 1A and light grey icing. Cover tops of cupcake with light grey icing.
Prepare decorating bag with dark grey icing. Cut 3/8 in. tip off end of bag. Pipe 3 to 4 curved lines on each cupcake.
Using spatula, ice cupcakes smooth, blending colors together.
Lightly spray cupcakes using Black Color Mist.