If you’ve been in the community long enough, then there’s no way you would have missed hearing of Skyblock — especially if you’ve played on any of the multiplayer servers in Minecraft. There's a Single player version as well.
Skyblock basically drops you off on a small floating island in the sky. You’re given a chest that contains all the tools required to make a cobblestone generator.
Other items in the chest include a full set of leather armor, an apple and maybe a sapling too. It really depends on the server you play on or the mod you download.