These are some different modifications you can do an mp3 player. Some of them can only be done on hard drive based mp3 player, however im not sure if this can be done to a micro drive. The instructions are going to be pretty general because of the different types of mp3 players out there.
I started doing most of these because I crave being different. Not only was I not going to be one of the mindless millions who bought ipods (I am the anti pod) but I was going to have a mp3 player completely different from anyone else's.
The mp3 player I modified was a Creative Zen Nomad 20 gig.
Step 1: Duct tape sleeve
All you need is a roll of duct tape, scissors, a razor, and some parchment / wax paper. I started by making a sheet of duct tape that was slightly more then twice as tall as my mp3 player and about 2 and a half times as wide. The basic idea is to have a sheet that if folded around your mp3 player would be able to cover all of its faces.
To make the sheets you will cut strips of duct tape as long as the double height length. So if your mp3 player is 3 in. tall you will want strips 7 or 8 in. tall. Place one strip face up on the wax paper, then place the next strip face down on the first one, so that half of it is on the first strip and half of it is on the wax paper (look at the picture if your confused). Flip the piece over and then place a third strip down half on the exposed sticky tape, and half on the paper. Repeat this process until you have a sheet wide enough to use.
This method of making duct tape sheets can be applied to anything that you want covered in duct tape, but that you dont want to get sticky or that you want to be able to remove it.
When you are done making the sheet fold over the remaining sticky edges. Place your mp3 player in the middle of the duct tape and try to figure out the best way to fold it on. You will probably need to cut at least 2 sides to get the right folds. I cant really give instructions for every mp3 player, so just do it to the best of your abilitys. If you have a somewhat rectangularish mp3 player like mine, you can cut out the corners of the duct tape sheet, so you are left with a piece somewhat resembling a cross, and then fold up each face, to cover each side of the player. Then use extra pieces of duct tape to seal the different faces together around your mp3 player.
Use the razor to cut out any buttons and the screen through the duct tape. Make sure you take your mp3 player out first, so you dont scratch it with the razor.