Quite cool I think. Perfect for those cold rum concoctions of summertime. Sure, it's pretty expensive as an ice cube tray, but it's got a high novelty factor. Pair it with a good Easter Island drink and you have a new tradition in your home.

My recommended drink for these ice cubes:

"Pisco on the brainstem"

5oz  Pisco (duty free shops in South America have the cool Moai bottles for much less than any US liquor stores)
3oz  Fresh lime juice
2tsp Cane Sugar (Maui sugar is best)
1oz  Limoncello (or Orangecello)
2oz  Lemon sour mixer

Pour over Maoi ice cubes. Top with 151 rum.