The parchment tube worm, though it can't actually see, has not one but two kinds of beautiful bioluminescence. Shine the right kind of light on it, and it'll glow bright green--but poke it, and it'll spew out a bunch of mucus (usually used to build its protective tube-like home) that glows bright blue. Says New Scientist:
A new study has pinpointed exactly how the worm's mucus lights up the seas. Led by Dimitri Deheyn of the Scripps Institution of Oceanography in La Jolla, California, it has identified the light-active component as vitamin B, otherwise known as riboflavin, although the exact chemical form that makes the blue glow has yet to be identified. Deheyn speculates that this novel chemical reaction might act as a lure for prey or a deterrent to predators.