Glow sticks in the pool, great for night swimming! Not sure this would be the best idea for a big in ground pool (would probably take a couple hundred sticks), but would definitely be cool in a kid pool or an above ground pool!
DIY your photo charms, compatible with Pandora bracelets. Make your gifts special. Make your life special! DIY Galaxy in A Jar - Bottled Nebula in A Jar - Cool Crafts and DIY Projects for Teens - Fun Gifts and Decor for Teenager, Tween and Teen Bedrooms
"These kawaii inspired Mason jars are a beautiful way to organize art supplies. They can also be used for storing or displaying a variety of other items like, flowers, succulents, utensils and straws at a party, and even toothbrushes in the bathroom.