4585502 Ice Cube Tray is one of the LEGO merchandise I purchased from the accessories selection at LEGO Shop Billund (see that previous link for box shots).

LEGO Ice Cube Tray

The tray is red, made of bendable rubbery material. It can hold 10 ice cubes that gain a nice 2×4 stud pattern on top – although, unless you manage to suitably pile two ice cube trays, there won’t be any matching holes beneath the ice cubes. No building ice castles with these, then.

Anyway, the ice cube studs formed in the tray look surprisingly good. Nice ice bricks, sure to entertain kids and/or give guests something to talk about.