What flavorings do you use for sour pickles?
Depending on the main ingredient, some additional flavours can be added using the following:


Coriander Seed 
Yellow or Black Mustard Seeds
Dried Chillies
Allspice
Ginger
Black Peppercorns
Bay Leaves
Juniper berries
Cinnamon stick
Fennel seed
Cloves
Celery seed


Combinations of the above can provide some really great flavours.