Who knew that slapping a heart on the side of a 3D rendered cube would turn it into one of the most beloved video game characters of the past five years? Definitely not Valve, otherwise the developer would have had this Companion Cube Ice Tray on the market ages ago.

It's one of the most obvious product tie-ins ever. Companion Cubes? Cubes. Ice cubes? Also cubes. So it's surprising that it's taken so long for marketing minds to make the connection. But don't get too caught up on how long it took them to get here; just be happy that you can now order one of the food-safe silicone rubber trays from ThinkGeek for just $13. [ThinkGeek]