ipod- effect tutorial for GIMP?

I've been wanting to try making some of those "ipod" icons.  
Here's an example:  by peacefully

I have checked the memories, but all of the tutorials that I've found are for programs that I have no idea how to use, and I haven't got a clue how to translate the instructions to what I use (GIMP). Yet I have this nagging feeling that I've seen a GIMP tutorial for this somewhere- I think they used a Harry Potter image for their example. Does anyone by chance know if such a tutorial really exists? Thank you in advance.