A more sinister look the Minecraft overworld! Works best at night! Also includes reskins of hostile mobs!
How to install this skin.
1. Navigate to My computer > C: > Documents and settings > User (You) > Application Data > .minecraft > Texture Packs.
Note: Windows Vista has a folder called "Roaming which you need to go in to"
Note: You may have to enable the viewing of hidden files and folders!
2. Extract the zipped files here and select them on the main menu in-game.