Just as the title says, I think we should be allowed to use a Bonemeal on Glowstone to form a stalactite of Glowstone, but only inside the Nether. I see it working because I can pretty much equate Glowstone stalactites in the Nether to trees in the overworld.
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Maybe it's a bio-luminescent coral.
No support, you've done nothing to balance this suggestion.