Combine 2 cups sugar and 2 cups water in a large saucepan over medium heat and stir until the sugar dissolves to make the sugar syrup.
Set the sugar syrup aside to cool completely.
Thaw all frozen fruit: blueberries, peaches, mango chunks, cherries, strawberries, blackberries, and raspberries.
Working with one fruit at a time, add the thawed fruit to a blender with about 1/4 cup sugar syrup.
Blend each fruit until smooth to make individual fruit purees.
Rinse the blender thoroughly between each fruit to keep the flavors distinct.
Optionally, strain each puree through a fine-mesh strainer for a smoother texture.
Arrange the fruit purees in separate containers with small ladles or spoons for serving.
To serve, pour about 1/4 cup of chosen fruit puree into the bottom of a champagne glass.
Top the glass with chilled sparkling wine or sparkling grape juice.
Let guests experiment by mixing or layering multiple fruit purees.
Serve immediately and enjoy the refreshing, colorful drinks.