This is actually pretty cool!
A downloadable resourcepack
This is MCAlpha, a resource pack for Minecraft made to look like Alpha. Features include:
- The original green grass
- The original green leaves
- The original cobblestone
- All wood is the same (except nether variants)
- The original Classic colors
- The original water and lava
- The original mineral blocks
- Unused features given new life (rubies, cyan flowers, original stonecutter, angry villager particle)
- "Alpha-ified" new textures (loom, smithing table, grindstone, new nether blocks, piglins, honey blocks)
- Old sounds (door opening/closing, bow firing, arrow landing, splash)
There's also a datapack ("AlphaPack"), which adds several old crafting recipes and the original Achievements.