J. Montana brought this up last night, and the interweb didn't make me need to look too hard to find the story...Researchers in Taiwan have too much gold and an arbor abundance, which gave them the idea of replacing streetlights with bio-luminescent trees. How? By injecting the leaves with gold nanoparticles, which when put into the leaves of Bacopa caroliniana plants, causes the chlorophyll to produce the reddish luminescence. This could ultimately reduce carbon emissions and cut electricity costs. The discovery came about by accident when scientists were trying to create lighting as efficient as LEDs without using the toxic (and expensive) phosphor powder that LEDs rely on.
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