PREPARE the avocado salsa, combine all ingredients in a large bowl and toss until well combined. Refrigerate until ready to serve.
FOR the blackened shrimp, combine the spices in a small bowl and mix well. Place the shrimp in a large ziploc bag, add the spice mixture and shake until the shrimp are well coated.
HEAT the olive oil in a large pan and cook the shrimp for about 2-3 minutes on each side, until pink and opaque.
ASSEMBLE, fill each lettuce leaf with a bit of shredded cabbage, diced tomato, and a few shrimp. Top with avocado salsa and serve!