The sound is a bit icky, but this tutorial by Nicky is worth watching if you're into Minecraft. He explains how to transfer your Minecraft models into Blender and fix up the materials definitions.
In this tutorial you will learn how to import minecraft world into Blender using Mineways.
If you want to import minecraft worlds into Blender, there are some problems with the interpolation mode. My python script changes the settings for the materials, so that the texture setup is better.
We are going to look short at the functions of mineways and the I will show you a script to setup the materials because at default blender has enabled interpolation of pixels in the texture and this is wrong.