Bluebirds can bring flashes of azure color and mellow songs to where you live. The best way to bring them close to home is with nest boxes. You’ll need an untreated wood box with a one-and-a-half inch hole five feet above the ground. Finding the right place for the nest box is important, too. Shrubs that bear small fruits can entice bluebirds. Find instructions for building an effective bluebird nest box  at BirdNote.org.