01 - In a large measuring cup or pitcher, gently mix cranberry juice, orange soda, and lime juice if using until well combined.
02 - Add 2 scoops of vanilla ice cream to each of two tall glasses.
03 - Evenly pour the cranberry-orange soda mixture over the ice cream in both glasses.
04 - Garnish with fresh cranberries, orange slices, and a dollop of whipped cream if desired.
05 - Serve immediately with a straw and a long spoon.