Or you can use a resources hacker like ResHacker or Restorator in order to change the picture inside your explorer.exe (safest method !)
(C:\Windows\explorer.exe)
HOW TO CHANGE ICONS ON THE SUPERBAR :
First, place your shortcut on the desktop, change icon by : right-click > Properties > Change icons > browse..... > OK > OK only then place this shortcut on the superbar, and now it works.
Ha ha... really though--take your time. Good stuff as always.