I've tried out all of the brushes in the set, and they will work great in any retro or grunge design. Even better, they're super high-res all being around 2000X2000px in size. You can also use these brushes however you like, as part of an open license.
Free Retro Brush
Old Post Card Brush Set I
Spooky Brush Set
Category : Brushes
Source : anodyne-stock.deviantart.com
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Circles and Drips Brushes Set
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