Thing is I think with new versions of the game at least on PC, the seed generation was changed so one seed that looked a certain way on 1.6 or so would look different in 1.8. If you want to do creative on that seed, make sure you have the world saved before the update. You won't have the new seed generation features (ravines, mine shafts, villages) but you will still have the awesome seed.
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I have moved to PC gaming for the most part, so I won't be on Xbox LIVE much anymore.