At work one day, the day before the release of a product, my hard-drive went out. I kept it on my desk for a few months to serve as a warning to others. It was at this time I discovered that hard driver platters also make great coasters with the often flat rounded top. If you open them up you can also find a great mirror that also doubles as a novelty to look at. Just put the cover back on, just use one screw, and you can keep dust from dirtying your mirror up. Don't get me started on just how hard it is to clean the thing if you get fingerprints on it.
Besides the novelties of the hard-drives a friend of mine made a few trinkets from USB drives. Between the necklace, don't ask, they were used to store games for different consoles in emulator (SNES, Sega, Nintendo) form. A good spray job (red, yellow, green) to distinguish the consoles they were great for short term fun. Since they held enough to be useful might as well make them handy. Along with that if you setup a little net at the desk they double as mini basketballs. I've accidentally run over mine with a car, washed it twice, and they keep trucking. You could even get a USB hub, plug them all in, and use them as tiny hard-drives. Anyway, back to work I go.