Glow in the dark Splat Balls are the coolest.
Simple in their super squidgy rubbery ways,
Wet them, and toss them at the ceiling, then wait to catch them as they slowly (or quickly) peel off and fall.
Great to use as a stress ball too, and great glowing ornaments in your bedroom at night.
Glow in the dark Splat Balls definitely are the coolest.