Well, a great way to make popcorn strings for a Christmas tree is by using a needle and thread. First, you need to pop some popcorn and let it cool down. Then, thread the needle and poke it through each popcorn kernel. Make sure you leave a bit of space between each kernel so that the string has some room to hang on the tree. Once you have a long enough string, tie it to the top of the tree and enjoy the festive decor!