I got some fun patterned cardstock that was the natural paper sack color on the other side and printed the cards out with the fun patterns on the back. The tan paper sack color helps with the vintage look and feel.
Then I took my scissors and ran them across the sides to give them that warn feel.
Finally, I packaged them up with a little twine and wrapped them. I made about 5 sets of these for all the little ones (18 months or older) for Christmas.
Have a great one!