This selection of birdhouses will have you rethinking the wooden variety from here to eternity.
Our first example is actually a store-bought option, but any metal teapot will do. All we'd need to do is drill a hole in the bottom to hang.
Another teapot but of the vintage variety. This one is available on Etsy, but, again, great inspiration for an upcycle.
Love the simplicity of this next one, which involves a pot, a circle of wood and a some fixings.
How about giving an old boot to the birdies?
If the last option is a rambler, this next one would be a two-story.
Our final option isn't a birdhouse, but it was too clever not to include in our list. A tea cup + saucer + E6000 = bird feeder.