2015 Indoor Halloween Decoration Ideas. For many decorating the outside of the home is the best way to celebrate the Halloween season, but if you’re really into scaring others and being festive why not turn the inside of your home into a creepy palace as well. From the bathroom, to the kitchen, to the living room. There are so many ways you can get your family in on all the Halloween spookiness by decorating inside your home. Look below for a few ideas, and they may just become your new favorite tradition!