Stir pineapple juice, orange juice, and lime juice together in a large pitcher or punch bowl. Add pineapple, blood orange, and lime slices. Cover and refrigerate for 2 to 24 hours.
To serve, pour 1/2 cup juice mixture into each glass or champagne flute. Add 1/4 cup Prosecco per serving. Slowly drizzle in 1 teaspoon Campari. Garnish each mimosa with a fresh pineapple or orange slice.