If survival is your game, you can't go wrong with this frigid environment. It features ice spikes as far as the eye can see, along with the sea itself in a vast, empty, and hostile world. It's just waiting for you to either shape it to your will--or die trying.
The snowy monotony of the landscape and the lack of other biomes go far in giving this world a slightly menacing atmosphere that goes along very well with survival mode and, of course, Halloween. If that doesn't help you get into the spooky spirit, the fact that you have to find some kind of protection against the cold if you want to stay alive should.