Inspired by Reddit user ArkadyGaming, I've brought the Minecraft Beta menu panorama back to life with SEUS PTGI shaders. All thanks to the group of people at minecraft@home, we now know the exact seed used to create the original background panorama. Check out their efforts here. The pack comes in various flavors including morning, afternoon, afternoon blurred, evening, and classic blurred!
EVENING
MORNING
Also check out my Unity and Unity: Dark Edition resource packs, which include themed main menu panoramas!