To prepare romesco sauce, place first 10 ingredients in a food processor, and process until smooth.
To prepare salmon, sprinkle salmon with paprika, oregano, and 1/4 teaspoon salt. Thread 2 salmon pieces onto each of 24 (6-inch) skewers. Arrange on a broiler pan coated with cooking spray. Lightly coat salmon skewers with cooking spray. Broil 5 minutes or until fish flakes easily when tested with a fork or until desired degree of doneness. Serve with sauce.