Combine sherry and saffron; set aside. Coat a large skillet with cooking spray; add bell pepper, onion, ham, and garlic, and sauté 4 minutes. Add sherry mixture, tomatoes, almonds, salt, and pepper; bring to a boil. Add clams; cover, reduce heat, and simmer 3 minutes. Add mussels; cover and simmer 3 minutes. Add shrimp; cover and simmer an additional 5 minutes or until shells open. Discard any unopened shells. Sprinkle with parsley.