Step by step instruction:

    1. Download the icon you need. A sheep on a bike, for example:
How To Customize Folders on a Mac | picture

 

    1.  Open in preview -> Select All (⌘A) -> Copy (⌘C)
How To Customize Folders on a Mac | picture

 

    1. Select the folder -> Get Info -> Click on the picture -> Paste (⌘V)
How To Customize Folders on a Mac | picture

Try tools for creators by the Icons8 team:

Icons8 Icons8, a library of about 130K+ icons and clip art images
Offline app icons8 Offline app and plugins to drag’n’drop icons and clip art to any design tools
Moose Moose, the big collection of high-quality stock photos
illustrations Ouch! , a library of vector illustrations and collages
Background Remover Background Remover, AI-based online tool for removing background from any photo
Mega Creator Mega Creator, online tool for creating visual content from pre-made elements
Fugue Fugue, royalty free music for videos of any kind
Lunacy Lunacy, free graphic design software with built-in design resources
Smart Upscaler Smart Upscaler, image upscaler to enlarge and enhance images using AI
Generated Photos Generated Photos, unique, worry-free model photos generated by AI
Also, get the lists of free vector software and free photo editing software.
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