1. Preheat grill to 350° to 400° (medium-high) heat. Peel shrimp, leaving tails on; devein, if desired.
2. Place shrimp in a large bowl, and drizzle with olive oil. Sprinkle with seasoning, and toss to coat.
3. Grill shrimp, covered with grill lid, 2 to 3 minutes on each side or just until shrimp turn pink.
4. Thread each skewer with 2 grilled shrimp, 2 blackberries, and 1 mango slice. Brush with Mint-Lime Drizzle, if desired.