Making paper flowers is a tradition in Mexico on Cinco de Mayo or the Day of the Dead (Dia de los Muertos). Craft these cheerful flowers as part of a Mexican-themed lesson or party, or make a bouquet to give as a gift or use as lovely room decoration.
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If your friends kids are party-crashing, make a few of these paper pinwheels to keep them entertained (at least for a little while.) Or if they're older set out the materials and let them assemble them.