I don't think I've seen either suggestion before, actually.
Great. It's nice to know that I got some original ideas. As for the planks from broken barrels and crates, I think the idea could be extended so that breaking things could sometimes results in getting the components used to make said things.
Large crates could "drop" planks, and nails.
This gave me a new idea (which unfortunately won't be easy to implement, probably.) Termites. You could get them from breaking crates (drop chance ~5%.) You could then infect benches, and watch as they crumbel down on the person sitting on it. A nice visual, but no real chance to implement it, for a number of good reasons.