Streetpass Items

http://www.acnewleaf.de/guides/besondere-items/streetpass/

Here is the list of items you can receive from players in the reception area
  (These items do not appear in the catalog, but the balloons can be ordered
  if they appear in a Model House.):

...Bubble Wand
...Blow Streamer
...Round Balloons (Aqua, Blue, Green, Orange, Pink, Purple, Red, Yellow)
...Bunny Balloons (Aqua, Blue, Green, Orange, Pink, Purple, Red, Yellow)
...Heart Balloons (Aqua, Blue, Green, Orange, Pink, Purple, Red, Yellow)
...Pinwheels (Aqua, Blue, Green, Orange, Pink, Purple, Red, Yellow)
...Ice Cream Cones (Vanilla, Strawberry, Lemon Double, Mint Double,
                   Vanilla Soft, Chocolate Soft, Mixed Soft, Green Tea Soft)

The first ten times that you StreetPass with a particular player, you can
  receive the following items:
...First time - nothing
...Second time - a round balloon
...Third time - a round balloon
...Fourth time - a pinwheel
...Fifth time - a bunny balloon
...Sixth time - a Bubble Wand
...Seventh time - a heart balloon
...Eighth time - an ice cone
...Ninth time - a soft cone
...Tenth time - a Blow Streamer
Starting with the eleventh time, the item you can receive is random.