Log Bird Feeder - 23 DIY Birdfeeders That Will Fill Your Garden With Birds (my note: I haven't looked at all of these, but at least one is a terrible idea. The window birdfeeder -- birds could fly into the glass and hurt themselves.
rebounced his tennis ball by making a bird feeder! Clever idea for a bird feeder! Wrap twine around a tennis ball and put underneath the pan – bring the two ends of twine through the top and tie onto the tree