This works nicely for the fourth of July, too.
Fold and cut as indicated. Some of us need to practice a few times to get it right. Cut them in various sizes. Paint, spraypaint, brush with glue and sprinkle with glitter. Hang on the tree or attach to ribbons and hang from the top of your window or mantle.
Making mistakes is a valuable part of the process. Try to figure out where you went wrong and how to make it better, or differently, next time.