Place one sugar cube and two sprigs of fresh mint into a chilled highball glass. Add two cubes of clear ice and slowly pour in well-chilled champagne or sparkling wine, stirring constantly. A splash of bourbon is optional. Garnish with slices of fresh fruit, if desired.
Stir together 1/2 ounce of Grand Marnier or Cointreau with one ounce of cranberry juice into a champagne flute. Squeeze in juice of one small wedge of fresh lime. Fill with champagne or sparkling wine.
Pour iced champagne or sparkling wine into a large chilled wine glass. Add 1/2 ounce of Crème de Cassis, and stir gently. Garnish with a twist of lemon peel.