Make a rug loom with PVC pipe. Weave around top/bottom and sides of PVC to keep the weaving from pulling in. When done, just take apart the PVC and slip off the rug. What a great idea from Pink In Mind.
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.