Why not add a shot of technology to the mix? LiteCubes are freezable nontoxic plastic 1″ blocks that light up.
Each LiteCube contains an FDA-approved freezable gel. You can use LiteCubes to keep your drinks cool without watering them down. But the star in each cube is the LED. LiteCubes come in single or multicolored variants. You can set the light to glow steadily, flash slowly or at a seizure-inducing pace. You can also turn the LED off, which you should do after ever party. The lithium battery inside is not user-replaceable and is only guaranteed to last up to 12 hours.