Everything is better with sprinkles! Adding sprinkles to store bought ice cream sandwiches makes them even more yummy (if possible) and is an easy way to make your party a little more special. You can use confetti quins, non-pareils or jimmies -- I've tried them all, and they're all delicious.
I added about 3 ounces of sprinkles to a plate and had enough to decorate 12 ice cream sandwiches. Dip the sides of the ice cream sandwiches lightly into the sprinkles and layer the finished ice cream sandwiches between sheets of wax paper. When you're done (or after every few sandwiches if it's hot and they're starting to get soft), place the sandwiches back in the freezer until you're ready to serve them.