Script Summary: Allows you to change the Newgrounds level icon to one of your own choosing.
To set the picture you want go Tools>Greasemonkey>User Script Commands>NG Icon Change Preferences if you use firefox or click the 'Change Icon' button in Chrome. You can also set whos icon you change; you need to be logged in for your own icon to be changed if set to 'Yours'.
Due to how Chrome saves data this script does not work on sub-domains i.e Userpages. If you update your icon on a sub-domain it will only be saved on the sub-domain. All other features work.