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.
Recycled door would make a great trellis. This has barbed wire spirals connected together to form a panel. Thinking barbed wire would not be so good as a trellis, as the yearly clean out of dead vines would be a bear!
Wood pallets as fencing - Set them up nicely and add a dash of paint. This could work. (Its not exactly furniture, but seeing as all my other furniture so far is made from either pallets or crates, I thought it fit in well)