The lostwave texture pack is our custom textures. We changed the texture of some rarely used blocks so we can have additional building blocks.
It is not required that you use this texture pack, but some things will look really weird if you don't. Plus if you want to be [Superbuilder] you should really use the texture pack as it gives you more building choices.
You can download the texture pack here: http://lostwave.com/mc/lostwave.zip