This seems like a really great idea for some geeky cocktail ice. The best ice for mixed drinks is large, solid, and ideally clear.
At 1.5 inches, I’m not sure this is really large enough to do the trick, but for $9 it may be worth trying. The listing also suggests you could use it as a chocolate mold. Finally, there’s also a comment on Amazon of someone using it as a concrete mold for a small detail element of a project. So even if the ice thing doesn’t really work out, having a borg cube handy seems like a great idea.
This silicone rubber mold will allow hungry Star Trek fans to cast up gelatin and chocolate in the shape of a 1.5″ Borg cube, thereby turning one of the Federation’s greatest threats into a bite-size morsel of deliciousness. Or make a Borg ice cube, and keep your beverage of choice as cold as the depths of space! Refreshment is futile! Comes packaged in a full-color window box.