Here you will find a FREE leather material to use in cycles:
http://pasteall.org/blend/index.php?id=44610
The leather material uses a node group (It looks nicer than a spaghetti of node strings) allowing you to control everything you would want to change in just one node in the node editor.
To use this material for a scene your working on.
File > Append > LeatherMaterialMark_C-CC0.blend > select leather material
The material will now be ready to assign to your 3D meshes
Released under CC0
https://creativecommons.org/publicdomain/zero/1.0/
Happy Blending!