What do you get when you combine a bike helmet, battery-powered lights, and a big plastic salad bowl? If you were going to guess an awesome DIY jellyfish costume, you’d be right! Carrie Ortiz cleverly combined these everyday items to create a glowing Halloween costume that anyone can replicate. Just glue color-changing lights to the inside of a clear salad bowl, attach strands of cellophane to the bowl, then secure the whole thing to a bike helmet, and voila! You’ve got yourself a dazzling costume that will light up any party.