When flying super-high in creative the sky becomes purple, as opposed to blue. this is best observed by using the /tp command to teleport to a very high y value.
How to replicate:
1. Create a new creative world.
2. /tp to a very high y-value, around 1000000, however the effect can be seen as low as y=5000.
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Cannot reproduce. Screenshot pls?

Will post--check in a few minutes

First one (blue); y=130
Second one (purple); y=100000

still in 18a

Confirmed. Also, the sky is already darker at y=256 in 14w20b.

This (bug i think)it appears on ps3,xbox 360,minecraft pe and minecraft pc and i think it is biome lighting change(im not sure!)

Confirmed for 14w21b.

Confirmed for 15w43c.

Confirmed for 15w44a.

I'm very curious as to why this issue was marked WAI. What is the intention for it?

What is the intention for it?
That the sky change color at high altitudes? That's kind of how it works in real life, so I don't understand why anyone would think it's a bug. Also, it helps give the player a sense of motion that's otherwise lacking at high altitudes.

True, but if this were the case wouldn't the sky get blacker?

It gets darker, doesn't it? You presumably never leave the atmosphere though, since the Minecraft world is infinite~ish in all directions. So you never reach the icy blackness of space. There's still atmospheric diffusion, giving the sky a color, rather than it turning black.

what I still don't get about this resolution is that even if the sky is supposed to become purple as you go higher, it's not noticeable within the range of y-values normally accessible in survival. The only way to see this is to go into creative and fly up, get teleported up, or possibly get launched out of a tnt player launcher. What's the point if it's not noticeable?