I don't know anyone who hasn't made lightsaber noises while playing with noodles in the pool, and now with some duct tape and about five minutes, you can make your pool noodles look just like a lightsaber!
Cut your pool noodles in half. Scissors won't really work, but a sharp knife, or even a small saw will get the job done.
Wrap the bottom of your pool noodle in silver duct tape. You're trying to cover the bottom fourth or so of the noodle.
Wrap three rings of black electrical tape around the top of the silver tape.
Take two pieces of black tape and stick them to the bottom of the tape like this.
Now you have a super cool pool noodle lightsaber! May the force be with you!