Store Jello balls in an airtight container in the fridge for up to 1 week, separated by parchment to prevent sticking. To freeze: place on a tray to freeze, then transfer to a bag—thaw in the fridge before serving. Avoid microwaving. For variations, try swapping Jello flavors, using sweetened coconut, adding sprinkles, or rolling in finely chopped nuts. Kids love to help make these!