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.
Pine Cone Mulch - an attractive border and maybe a practical way to keep dogs and cats out of your garden beds. As they breakdown, they will add nutrients to your garden too. Pine cones also look great as a decorative mulch for container gardens.