If you want to customize the look of your folders, shortcuts and other file types in OSX then here’s how to do it:
- Open your desired icon (PNG format for background transparency).
- Hit Ctrl+C (copy), make it sure that you are currently on Preview application when you do it.
- Then right click on the shortcut/folder/file that you want to change the icon, then select Get Info.
- Click the icon from Get Info window, then click Ctrl-V (Paste).
And your done, icon of your shortcut/folder/file has been changed.