I know where those stickers came from. I have a sheet of them in my Rocksmith game box. I've never used them because by the time I got the game, I already knew what frets where where. But I could see how it would be useful to someone just starting out playing, especially playing Rocksmith. The game scrolls the fretboard towards you using numbers, so it makes it a bit easier. They also sell custom-colored string packs for Rocksmith, but they're ridiculously over-priced...like $20 for a pack of 6 strings.