Before posting a comment saying that this was already posted these ideas names are the same but are COMPLETELY different http://www.minecraft...-for-nostalgia/ <== see for your self.
The biome is randomized so it looks exactly like a already existing biome but the difference is when you enter the screen will flash white once for 1 second then return to normal alerting the player that there in a nostalgia biome.
If the player builds in this biome and re-enters the biome but there will be a flash back to how you started and a quick video of what you did in the first few minutes (the video is spead up.)
GUIs:
If you don't want the flash backs press esc to pause the game then there will be a new option the option will say flash backs then have the same ON/OFF system as other settings.
The biome is randomized so it looks exactly like a already existing biome but the difference is when you enter the screen will flash white once for 1 second then return to normal alerting the player that there in a nostalgia biome.
If the player builds in this biome and re-enters the biome but there will be a flash back to how you started and a quick video of what you did in the first few minutes (the video is spead up.)
GUIs:
If you don't want the flash backs press esc to pause the game then there will be a new option the option will say flash backs then have the same ON/OFF system as other settings.
Odds of finding one:
Up to Jeb or Notch.
I live where your not.
I'm sorry OP. But this idea is just bad.