In a game like Minecraft, you honestly never know what you're going to get. The community is filled with creatives who know a thing or two about building in a game created from blocks, they have all the building blocks they could ever need to make some amazing structures.
Speaking of which, there are tons that pop up in both fan-made and developer game creations -- towns included. It really is an "if you can think it, you can make it" type of deal and Halloween is all about creativity.
Minecraft community creators have made plenty of impressive Halloween themed houses and places and I've got 8 of them just for your viewing pleasure. Keep clicking to check them out.