http://www.mp3-box.org/play-mp3-on-ipod-touch/

How to put pictures on iPod songs?
Okay, so you know how there’s sometimes pictures that come up with certain songs on the iPod touch (mp3 player, not phone)?
I want to add images to the songs which didn’t come with album art or anything.
How do I do it so they show up when the song plays on my iPod?
Thank you!
1. Locate the iTunes icon on your computer’s desktop or on one of the icon toolbars on the bottom of your screen. Open iTunes so that you can take the following actions.
2. Scroll through the songs in your music library. When you find the song that you would like to edit, highlight it with the mouse.
3. Now go to the File menu and choose the command Get Info. This allows you to access the identification information for that particular song.
4. The info screen for that particular song will now appear. This screen will have several textboxes to record the song’s information. At the top of this screen are five tabs. Click the last tab which says Artwork.
5. Now you will see a window that shows artwork already stored with this song, or the window could be empty if no artwork is available. Click on the Add button at the bottom of the screen to browse for more artwork to add to this song. When you find the picture you like highlight it and hit Enter.
6. When you are done with this screen you can click “OK” to apply all of the new management changes or you can click Cancel to exit without applying any of the changes you may have checked.
Apple iPod touch 4th Gen. 8GB MP3 Video Player with Acce…