The last time you hosted a party, you forgot to add decorations to your shopping list and all you had on hand for your discriminating aunt’s 50th was a leftover Bob the Builder happy-birthday banner. Next time opt for these do-it-yourself lanternlike party lights. They put your holiday light strings to use year-round, can be assembled in minutes, and adapt to any occasion, whether the guests are dressed in diapers or draped in pearls.

To Assemble: Use a utility knife to cut an X in the bottom of three-ounce plastic or paper cups (select fun colors for a festive look), then slide one over each lightbulb.