Fill a chimney starter to the top with charcoal. Crumble a piece of newspaper and place in the bottom of the chimney starter. Light the paper and place starter on the grill. Let coals heat up.
As coals are heating, cut eight sheets of heavy-duty aluminum foil in to 12- by 14-inch pieces, using two sheets of foil per packet. Divide potatoes, corn, shrimp and sausage (if using) with each of the double-lined foil sheets, layering ingredients in the center.
In a small saucepan, melt the butter. Stir in the lemon juice. Spoon about 2 tablespoons of the butter mixture evenly over each. Sprinkle creole seasoning and smoked paprika evenly, following with the fresh herbs. Add salt and pepper.
To make the packets, fold the bottom up to the center. Fold each side in to the center, then fold the top down to the center.
Pour coals from chimney and scatter around the bottom section of the grill. Add the grill grate and place the packets directly on the grate. Cover the grill and cook packets for 20 minutes. Serve warm.