Attached Link: Subject: Material Room, Nodes & Shaders - Tutorials and Discussions

you can create materials with the grouping tool but you have better tiime to use a mask to apply the displacement only where you want, you need some painting program (photoshop,Gimp, ...) and some work in the material room.

you can find links in the sticky thread : Subject: Material Room, Nodes & Shaders - Tutorials and Discussions