This is a set of 3 MatCaps for ZBrush which I have created for some tutorials I wrote.
I am making them available for Free so that you can use them as you like. :)
The SkyReflect and BlackBall MatCaps have been thought to be used as Layers in composition so that you can add some fake reflections/highlights. For example, make a render of your model with this MatCap applied and use it as layer in Photoshop with the Screen or Linear Dodge(Add) blending modes to add the reflections to your base render. Using Levels you can easily boost the reflections.
The Gold MatCap is a custom gold shader I created to be applied directly.
Enjoy!