Making your own pool party decorations gives you total control of the theme. Decorations are easy to make, and some will double as pool party supplies and favors.
Make sure your decorations are waterproof. Crepe paper dissolves when it gets wet. Colors in crepe and construction paper can run when they're wet, making a mess. You can have some paper decorations well away from the pool, but stick to plastic for anything the guests will be near. To save money, you can purchase party favors that can double as centerpieces, and be scattered around the pool area as decorations as well. Metallic confetti is also a safe choice, as long as it won't clog your pool filter.
Kids' pool party ideas don't need to be too complicated; the pool itself is the main attraction. Focus on safety and simplicity, and fun is sure to follow.
One major annoyance from spending time outside is the never-ending presence of mosquitoes. While usually not dangerous, mosquito bites can be painfully itchy for days afterward, and you need to know how to get rid of mosquitoes or at least keep them at bay.