Spread 1 tablespoon of salsa on half of each tortilla. Distribute the onion, green bell pepper, red bell pepper, tomato, cilantro, chives, olives, and shrimp evenly among the tortillas. Sprinkle each with cheese, and fold tortillas in half to cover the filling.
Lightly oil the grill grate. Place the filled tortillas directly on the grill. Cook about 2 minutes per side, until cheese is melted and the tortilla has grill marks. Serve with remaining salsa and sour cream.
