In the decor block you can make from mob heads into your head! and make blocks for decorations like a awesome block saying: Obsidian_Is_Awesome! or Minecraft_Is_Awesome! you can do anything with any block it will help you kill mobs because you can make EPIC swords like diamond encrusted obsidian sword or you can farm a lot better i mean a LOT it would also help by making custom mobs like creeper pig or a dragon and those mobs will be your pets! just think a dragon for a pet that breahtes fire LOOK AT ALL THE POSSIBILITIES! stacks of tnt lots of farms and the best THING EVER THE ONE THE ONLY! DECOR BLOOOOOOOCKK!