Kristina Automator!!

gistfile1.py

import mcpi.minecraft as minecraft
import mcpi.block as block

mc = minecraft.Minecraft.create()
#get this in case the player moves whilst the program is running
playerPos = mc.player.getPos()
#start everything a bit off so that way you don't get caught in the box while it's building
playerPos.x += 2;
playerPos.z += 2;

def makeRoom(w, l, h):
  for y in range(0, h):
		for x in range(0, w):
			for z in range(0, l):
				#check the space around the square being removed. if it is empty, add a block so the space will be enclosed
				#but don't add them every time because I want the locale to be part of my decor
				if y == 0 and (mc.getBlock(playerPos.x + x, playerPos.y + y - 1, playerPos.z + z) == block.AIR.id):
					mc.setBlock(playerPos.x + x, playerPos.y + y - 1, playerPos.z + z, block.COBBLESTONE.id)
				if x == 0 and (mc.getBlock(playerPos.x + x - 1, playerPos.y + y, playerPos.z + z) == block.AIR.id):
					mc.setBlock(playerPos.x + x - 1, playerPos.y + y, playerPos.z + z, block.COBBLESTONE.id)
				if z == 0 and (mc.getBlock(playerPos.x + x, playerPos.y + y, playerPos.z + z - 1) == block.AIR.id):
					mc.setBlock(playerPos.x + x, playerPos.y + y, playerPos.z + z - 1, block.COBBLESTONE.id)
				if y == h - 1 and (mc.getBlock(playerPos.x + x, playerPos.y + y + 1, playerPos.z + z) == block.AIR.id):
					mc.setBlock(playerPos.x + x, playerPos.y + y + 1, playerPos.z + z, block.COBBLESTONE.id)
				if x == w - 1 and (mc.getBlock(playerPos.x + x + 1, playerPos.y + y, playerPos.z + z) == block.AIR.id):
					mc.setBlock(playerPos.x + x + 1, playerPos.y + y, playerPos.z + z, block.COBBLESTONE.id)
				if z == l - 1 and (mc.getBlock(playerPos.x + x, playerPos.y + y, playerPos.z + z + 1) == block.AIR.id):
					mc.setBlock(playerPos.x + x, playerPos.y + y, playerPos.z + z + 1, block.COBBLESTONE.id)

				mc.setBlock(playerPos.x + x, playerPos.y + y, playerPos.z + z, block.AIR.id)

def dig(startX, startY, startZ, w, l):
	if nextLayerGood(startX, startY, startZ, w, l):
		for x in range(0, w):
			for z in range(0, l):	
				mc.setBlock(startX + x, startY - 1, startZ + z, block.AIR.id)

		dig(startX, startY - 1, startZ + 1, w, l)

def nextLayerGood(startX, startY, startZ, w, l):
	for x in range(0, w):
		for z in range(0, l):
			if mc.getBlock(startX + x, startY-1, startZ + z) == block.BEDROCK.id:
				return False
	return True

makeRoom(8, 8, 3)
dig(playerPos.x + 4, playerPos.y, playerPos.z + 4, 3, 4)
#TODO: automatic torches, stairs, add wall if digging exposes room