This resourcepack replaces assets of the Create addon Create: New Age to better fit with Create's and Minecraft's style.
All models, textures of blocks and items have been remade in a new style, which is supposed to be closer to the Create mod.
The resourcepack will be officially added to the New Age mod in the 1.2 update.
Link to the Create: New Age page
This works with all versions of minecraft. If you get a warning that it's incompatible with your version, ignore it, and proceed anyway.