Steak au poivre comes to mind - I found this recipe - http://www.foodnetwork.com/food/recipes/recipe/0,1977,FOOD_9936_31411,00.html - haven't tried it.
Did a search for "green peppercorn" on their website and came up with this list:
The tarragon green peppercorn vinaigrette sounds delicious.
I have used green peppercorns in combination with a 4 or 5 peppercorn mixture for grinding. I believe they are less pungent than the black. The pepper you bought is packed either in brine or vinegar. Here's a link which gives you some idea of how to use them: