For further experimentation.  I totaly cribbed this off another site.  My personal goal is to reduce the sodium because I love Old Bay, but hate the salt.

Old Bay Seasoning Recipe Ingredients:

• 1 Tbsp. Celery Salt
• 1/4 tsp. Paprika
• 1/8 tsp. Black Pepper
• 1/8 tsp. Cayenne Pepper
• Pinch Ground Dry Mustard
• Pinch Mace
• Pinch Cinnamon
• Pinch Cardamom
• Pinch Allspice
• Pinch Ground Clove
• Pinch Ginger

Preparation: Combine all ingredients in a small bowl. Store in a sealed container. Makes 4 teaspoons. Mix 50:50 with coarse salt when seasoning crabs.

Copy-Cat Old Bay Seasoning Ingredients:
• 1 Tbsp. Celery Seed
• 1 Tbsp. Whole Black Peppercorns
• 6 Bay Leaves
• 1/2 tsp. Whole Cardamom
• 1/2 tsp. Mustard Seed
• 4 Whole Cloves
• 1 tsp. Sweet Hungarian Paprika
• 1/4 tsp. Mace

Preparation: In aspice grinder or small food processor, combine all of the ingredients. Grind well and store in a small glass jar. Mix 50:50 with coarse salt when seasoning crabs.