They would look cool, but there's really no need if we look at how many blocks there are at producing light. Take for example a Torch, way easier to craft than getting sand, cobblestone to smelt the sand into glass because you need a furnace (+ you need coal or log to smelt anything), then make a glass bottle, then go out and find a firefly, and catch it.
Also, bees were just added. We are good for flying mobs at the moment.
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