Set of 3 Floating LED Pool Speakers. Simply toss the waterproof speakers into the pool and start the music, transmits wirelessly via from a single bass station. When not in the pool, the speaker work equally well on dry ground.
Helium filled balloons tied to weights in pool. If you want to create the illusion of floating balloons use fishing line which is virtually invisible. (IDEA- Could also ADD some glow sticks so that the balloons GLOW over the Pool at NIGHT!