I already made this a while ago, so no disassembly pictures.
I had a 4gb "flash" drive a while back and like most small things, I lost it. It was several months before it was found under some couch cushions, needless to say it wouldn't work. I pondered what to do with it for a while, and then an idea struck me, be gangster.

Step 1: Cracking

Needed: pliars, a thin and stiff blade of some sort, small scissors, a drill, a small drill bit, and small phillips/torx bits

First, take the ill-fated drive apart as gently as you can, easing the plastic open slowly untill the case starts to really pop off. Now take the drive out gently (you dont want a dented drive) cut all data and power attachments on the drive as close to the drive as you can. Now you take the screwdriver of choice and remove all visible and hidden screws.

Step 2: Blingification

Once you have the drives guts exposed, the fun can begin. look for the best place to drill a small hole to stick a jumper ring in or a necklace chain through. Drill the hole and test fit your chain.

If all went well, you now have some extrodinarily geeky bling you can show off to your nerd buddies or give as a geeky gift. Have fun!