Buy 4 small gifts. Take 2 decks of cards and shuffle them separately. Deal the first deck to everyone there until there's none left. Then take your second deck and turn over the first card. Whoever has that corresponding card picks a prize. After the first 4 are picked, keep turning over a card. The person with the 5th corresponding card takes one of the gifts from one of the 1st 4 winners. Keep doing this till you are done turning over all cards. The last 4 winners will not be the 1st 4.