8 pattern layer brushes by Michael Dunnam.
Take a look at free set by Michael Dunnam that can help you sculpt sci-fi panels in ZBrush in no time. The pack features 8 pattern layer brushes that can also be converted to drag brushes very easily.
This set uses the Layer Pattern brush. Each panel is tileable. They can also be converted to a drag brush very easily. The work awesome for quick inset pieces.
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note: Using the layer pattern brush is simple. You can paint in curved strokes, but using shift to paint a straight stroke is recommended.