You will need:
-An usb stick
-some minecraft pictures
Step 1: Get your Usb ready!
Step 2: Design, make the Minebox look better!
Then go to your usb stick, open notepad, paste this:
Then save as, name it "autorun.inf" under it, select all files,
Put the icon you downloaded in the same location as the autorun.inf,
replug your usb stick, now it should have the icon, if not, try again, or post a comment...