These brushes are what I call Anti-Shapes, which are line-based brushes that create a line of unique, organicish shapes that I use to craft abstract backgrounds quickly.

Category 1
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Belt Buck B
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Belt Buck A
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Zero Block
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Wave Wuthering B
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Wave Wuthering A
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Fence Shaped B
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Fence Shaped A
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Gate Shaped B
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Gate Shaped A
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Pigeon Aeon
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Artarc Aeon B
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Artarc Aeon A
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Ticked Battery Bar
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Battery Bar
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Crescent Divots
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Horned Hexal
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Botanical Branched
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Spinal Span
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Click Clasp B
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Click Clasp A
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Drill Tipped B
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Drill Tipped A
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Seperator Shape C
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Seperator Shape B
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Seperator Shape A
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Triangle Peaker