Are you talking about the honeycomb ones? I am clueless, too, but I suggest you hit the dollar store!
Pinatas are hollow paper mache pieces decorated on the outside with tissue loops or ruffles. Go to your library and ask the reference librarian for a book with directions for pinatas. Usually they are filled with hard candies and children take turns hitting them with sticks until they break, but there's no reason they couldn't be used as centerpieces.
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