Place one scoop of vanilla ice cream into each clear cup or mason jar.
Slowly pour 1 cup of chilled lemon-lime soda into each cup.
Drizzle about 1 tablespoon of grenadine into each drink.
Slowly pour about 1 tablespoon of blue sports drink or blue raspberry lemonade over the top for a festive red, white, and blue look.
Top with whipped cream, if desired, then garnish with red, white, and blue sprinkles, a patriotic paper straw, and a red, white, and blue popsicle.
Serve immediately while the float is cold and fizzy.
