Decorate cupcakes. On platter or foam board, arrange cupcakes in football shape, using marshmallows to fill in gaps.
Prepare 16 in. decorating bag with tip 1M and Autumn Brown icing. If needed, pipe pull-out stars on marshmallows to bring to same level as cupcakes. Starting at one end of football shape, pipe zig-zag, covering all cupcakes until covered.
Prepare 16 in. decorating bag with tip 789 and white icing. Holding bag with straight side of tip facing upwards, pipe vertical band on both ends of football.
Prepare 12 in. decorating bag with tip 47 and remaining white icing. Holding bag with straight side of tip facing upwards, pipe two horizontal lines, about 6 in. long, in center of football. Pipe 7 to 8 vertical lines, about 1 in. long and 1 in. apart, over horizontal lines.