Some of the nicest ones we received were little baggies with various stickers, candy, tatoos, etc. But the number you need to get depends on your budget and the system your disgroup decides to implement. Sometimes you are assigned a day; sometimes, you can deliver every day; or sometimes it's a free-for-all and you can deliver anytime and however much you feel like it. I personally like the latter, but it can result in completely empty FEs or overflowing FEs depending on what everyone else decides.