Melt butter in large stock pot. Saute onion, green pepper, celery and garlic until tender, being careful not to burn the garlic. Add tomato paste and cook to brown slightly, stirring constantly. Stir in bay leaves, Creole seasoning blend and Worcestershire sauce. Pour into a large roasting pan. Squeeze tomatoes to break up into pieces, and add to mixture in pan. Stir in juice from tomatoes, chicken stock, ham, sausage, chicken, shrimp and rice. Mix well. Cover tightly with aluminum foil.
Bake in preheated oven for 1 1/2 hours, stirring once halfway through baking time. Remove bay leaves before serving.