Idea #1: a hollow plastic ring containing a spherical magnet. The ring is wrapped with wire, and oriented horizontally, so that as the ring is jostled, the magnet rolls around and generates a current.
Idea #2: find some material that generates electricity when flexed (e.g. piezoelectric cable). Ideally, the material could be stiffer than normal piezoelectric cable, and generate more electricity. Mount the cable on trees (from trunk up along the branches) in a windy area. The wind can already flex the thick tree branches, so the idea is to harness this movement and convert it into electricity. Not terribly efficient, but it means power generation without replacing the trees with windmills.
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