Mac users: You already know how to customise shortcut arrows on your Windows PC, and you can do the same on aliased folders and files on the Mac (which include a small black arrow on the lower left by default). To remove aliased item arrows entirely, a simple Terminal command plus a
killall Finder does the trick. Otherwise you can create a custom icon and copy it deep in the bowels of OS X to overwrite the default. Looks like another nice Finder customisation for those of you who use aliases often.