Get ready to sham-rock your way to the most fun you've ever had on St. Patrick's Day. Channel your inner Irishman with a grown-up St. Patrick's Day party more exciting than the end of a rainbow.

To prepare the party snack, place the marshmallows in the jar as the “clouds.” Arrange the Twizzlers in rainbow order (Roy G. Biv!) and lay one end in the jar, allowing the other end to spill ...