As everyone may know, there is lots of ways to get back the old world generations at the current versions of Minecraft with different forms and ways, be it through mods, plugins or simply custom presets. Some examples are NostalgiaGen and Old World Generation, that brings back the old days world generation, though NostalgiaGen uses a new code to generate them, and there is no option to generate with the current biomes and temples.
I started replaying Minecraft about a month ago, and i installed a mod that would let me generate the old alpha worlds so i wouldn't need to give up at my mods and all of the added Minecraft content through the time.
But there is no existing mod, resource pack or whatever else that doesn't bring the old night sky and the alpha sunset from the old days.
At the alpha and beta versions, at night, the stars were much bigger, and the sky were much darker. And at alpha, the sunset wasn't orange.
Also, this is not really important, but the old bottom of the skybox were way more visible, unlike today. There was no fog on it, so the horizon acted as some kind of "ocean".
If you climb at a mountain at the current versions to see the sunset, you'll notice how foggy the horizon is, unlike Beta and Alpha.
I don't know if this is possible, but it would be great to see a mod that brings these features back as switchable options. It would be nice to watch the blue sunset and see the big stars again.
Night Sky Comparison, same world, same position(Same constellations included):
Horizon(Just notice how foggy the current version is, and a note, it's being renderized at the highest render distance possible with Optifine):
The horizon was more blue.
If there is any kind soul out there that can do it, me and the rest of the veterans would appreciate it.
Also, the night-day/day-night transition would be nice! The transition at the current versions are smooth, but at Beta/Alpha, the transitions were per level, you could see the blocks getting darker and darker.
(Skip to 2:13 if you want to spare your patience.)