Awesome
Sublime-Text-Icon
Just awesome icon for Sublime text
<h2>How to apply icon in MAC OS X Mavericks</h2>-
Find the icon you want (preferably PNG)
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Open it in preview, press CMD-A and CMD-C to copy it.
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Find the app whose icon you want to change and highlight it.
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Press CMD-I, and on the top left corner there should be the app's current icon. CMD-V to paste the new one.
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Quit the app and reopen.