Have a look at a new set of 16 Skull/Bone meshes & IMM brushes for ZBrush by Jonas Ronnegard.
- 8 Skulls & 8 Bones
- 2 LOD stages
- IMM Brush, ZTools, ZBrush source file
- OBJ & FBX files
To use the pack you need to use at least ZBrush 4r8 p2. “You can still add the OBJ files to ZBrush in older versions of ZBrush.”
You can learn more and get the pack for $6+ here.