https://i.ytimg.com/vi/W07H7xeUnGE/hqdefault.jpg
Read the text summary and download the .blend:
http://www.blenderguru.com/videos/the-secrets-of-realistic-texturing/
In this tutorial you will discover:
-The fundamentals of texturing
-How to use CrazyBump to generate better textures
-How to make a realistic cobblestone material
source