Fairy house building is a creative outdoor activity that can expand the imagination and bring to life the small things in nature that are easy to overlook. All you need is a small outdoor space and a few natural materials. Then — taking as much time as you want — construct a small home, fit for a fairy, frog or any other small creature that comes to mind. This zero-cost activity is great for kids, families and even adults who are looking for ways to have fun in their own backyards.