Can you change the iPhone music picture?

Basicaly I have a jailbroken iPhone 3g on 3.1.2 firmware. I don't buy from iTunes so all of my music is just mp3 with the ordinary sign.
Is there any app on the app store or cydia where u can change the backround on the iPod songs to the cover of the album without paying on iTunes??

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I buy my music from Amazon. Works fine for me. Do you have the cover art in the right directory?

In iTunes - just find the album artwork - and paste it tin - pretty straightforward.

Or you can also right click on a song, then select "get album artwork" and usually if the songs info is correct it will put on the correct artwork cover thing.