Well, it's been a while since I did one of these, so I'm going to try and get back to them.
This chamber is covered in glittering frost, and snow falls from the ceiling. The floor is slippery with ice (-1 to hit, damage, and any other applicable rolls), and concealed by the aforementioned snow. (50% chance of finding 10-20 GP worth of small coins, jewels, etc.). It was used by the elves to preserve meat, and is now being used by the Hob-bears to preserve elves.