After watching a tutorial on how to make cracked stone material from CGMasters, I've decided to recreate and improve my own version of said material. I've started by simplifying it and that build upon that. Added another layer on top of it to make it look dirty and stone-like. Then I though, you know what would be cool? Glow bits inside the cracks, so I've added them. So I present to you Procedural cracked dirty stone with glowy bits inside cracks material setup.
Tutorial can be found here: http://www.cgmasters.net/free-tutorials/cracks/