I make birdhouses of my own simple designs from recycled wood. I finish them with enamel paint with a flat black enamel undercoat. My birdhouses are sized for wrens and chickadees, the most familiar household birds. Anyone can attract them to their yards. I also make birdhouses that are purely decorative. I have birdhouses that are fitted to a corkscrew willow post with a metal spike to push into the ground. Birdhouses can also be attached simply to a wall or a fence.