If you are a big Helvetica fan, you should consider visiting Helveticons and find a large set of Royalty-free vector icons, glyphs and symbols based on the Helvetica Bold typeface.
There is a free vector pack for you mac folder icons that I have already installed and seems pretty… helveticised!
Tip: If you have never replaced the system icons before, it is pretty easy. As found on MacApper , all you have to do is Open the Get Info window for the RSRC icon, click on the miniature icon in the top left and press Command C (copy). Then, go to the drive or folder that you want the icon to be on, open the Get Info window, click on the mini-icon and press Command V (paste). Now you should have a perfect custom icon.
Enjoy!

