Here is a map I created for a server a friend and I used to own. It is approximately 5000x5000 blocks, and contains many biomes including Hell on Earth. Unfortunately it does not contain any 1.8 blocks :(. Since this world was created specifically for a server, the center island is perfect for building a spawn.

I will be sharing it with anyone who would like to use it. I would very much appreciate credit for my work, or at the very least let me know you're using it. All images were taken courtesy of Flyswatterz. Thanks, I hope you enjoy!

Don't forget to leave a diamond and keep posted! If you would like any more info please ask in the comments!