Students asked me before how I changed my Mac icons and I wrote this post Change your Mac icons. Students asked me again at the end of last year how I changed my Mac icons and so here is another post. The video explains it really well. You can just search for icons and download them and then use the preview pane to copy and paste the icons. Sometimes it doesn’t change. Don’t panic. If that happens on a folder it will invariably change when you reboot your Mac.I usually pick icons which support learning we are doing or a theme I am running in class. The video refers to Mavericks but changing the icons works the same way in all the previous versions of Mac OS.