- Download the icon set you want from here.
- Unzip the icon set (this should make a folder. Icons are in .png format).
- Open the icon you want to set your folder to and copy it cmd + c
- Right-click on the folder you want to customize and select "Get Info".
- Click on the icon to the left of the folder name in this view, and paste it cmd + v
- That's it!
There's more information in this article.
- Download the icon set you want from here.
- Unzip the icon set (this should make a folder. Icons are in .ico format).
- Right-click on the folder you want to customize and select “Properties”.
- Under the “customize” tab, go to the “Folder icon” section, click on “Change icon” button.
- Select the icon you would like to replace it with.
- Save and you're done!
There's more information in this article.