I created a little outline in the shape of the traditional donkey pinata.
Here is the link to the donkey outline (free to a good home). You could use this same strategy for any shape/design. This is what I chose. I cut it out of tagboard (you could also do this on any recycled box-cereal etc as the original tutorial suggest to be 'earth friendly). I cut out two shapes, and then a thin strip of posterboard to connect the two.
I tapped the poster board strip along the edge of the outline on one side.
I made mine just large enough to hold the gift card to the Mexican Restaurant. You could fill it with little candies or confetti just to make it fun.