Nether:
It has a tree that has Nether Bricks and Nether Quartz Ores.
Inside it has Soul Sand(4) and Glowstone(3).
Inside the chest has: Nether Wart(1).

Skyblock:
Same as Noobcrew's Island, but it has more items.
Inside it has: Sand(4), Coal Ore(1), and Snow(2).
Inside the chest has: ALOT of stuff you need.

The End:
It has no Obsidian, but it has Black Wool to make it look like it.
Inside it has: Block of Iron(1), Block of Diamond(1), Block of Redstone(1), Block of Budder(1), and Black Wool(4).
Inside the chest has: Spawn Enderman(1).

Squid Island:
It has Squid-Colored Wool tower.
Inside it has: Gravel(4), Water(2), and Block of Emerald(1).
Inside the chest has: Ink Sac(3), Budder(3), Water Bucket(1), Lapis Lazuli(1), Budder Nugget(2).

Notes:
* If the passive mobs don't spawn, cheat for spawn eggs.
* You sometimes spawn in the void, but I used MCEdit to fix the spawnpoint, so you sometimes spawn on the islands, sometimes you spawn in the void.
* I used commands: /gamerule mobGriefing false, and /gamerule keepInventory true.
* If your using Growable Ores Mod, use it for more ores!