I’ve been practicing a bit with Cycles nodes to create procedural materials in Blender (CarPaint, Brushed Metal, Stucco and Old Copper). It was fun!
The first 2 materials (car paint and brushed metal) are thanks to Kent Trammell classes, I made a group and changed the inputs in both materials to make it easier to set in the scenes. Also in the metal material, I added the corresponding displacement of the metal brushing.
The Stucco material is thanks to a blog post by Eduardo Maldonado, is good for distant pictures, he has a better one for close shots. In this case I only organized the nodes so that it was easier settings in scenes.