I found this recipe in the "Classic Appetizers Home Cooking" book. It's a nice summer salad, I used 16 oz of medium conchiglie shells and mixed as a salad rather than taking the extra time to stuff jumbo shells as appetizers. I may add a pinch of dill or garlic next time and the flavors come together a little more after leaving in the fridge overnight.
I have made these before and everyone loves them. Great (finger salad) or (walking salad) for parties of all kind. Don't be afraid to taste as you mix, you might like something else added. I some times add sliced almonds. Also don't over cook the shells