Ranking high on the "cool" factor, this is the ultimate addition to any themed party. Just fill with water (juice, colored or kool-aid) and freeze. Then drop in your glass of water. Drinking water will never be the same.
Everything from generic shapes like stars, hearts, flowers, and fish, to licensed characters like batman and superman. And they are not just for ice cubes. We've used them in the bakery for chocolates, and to make fizzy bath bombs.
New, about $10 for a set of 2. Mary's Cupboard has several for about $3 each.