This tutorial will show you how to change Any application/Folder on any MAC OS.
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Step1 : Select icon from any Folder/Application/Volume you like, and that would resemble on the new application/folder etc -> Then find a File/Application/Volume you want to change
<You can get a iCon off google, but has to be same size as others, and you can use that also>
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Step 2 : Click the application/folder/volume icon you want -> Click on File -> Pick Get info
< I took from my volume ex-vansaharya. Icon was "home icon">


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Step 3: Then click the Icon the very top left on that "info window" -> Then Select it
<The outline of the icon will be blue>

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Step 4: Go to the edit menu -> Click Copy

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Step 5: Now go to the application/folder etc you want to change the icon of.
<I did Documents>
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Step 6: Select the Application/folder you want to change -> Go to File Menu -> Click Get info

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Step 7: Again click on the very top left icon but this time on the application/folder you want to change
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Step 8: Go to Edit -> Click Paste


There. You have successfully changed a iCon of a file of your choice.