I knew a guy who used to take out the platters, put on sticky numbers, and make clocks out of them. They looked quite nice, in fact!
...you could always melt them down and make fishing lures out of them?
play hockey with them, use the insides as a puck? (tape around the edges of course, don't want to take out a limb)
buy a GPS, find a geocache, and put it in the box for the next person to find?
Try to RMA them, see if you can get a new, bigger drive for free?
make a winch for your car out of multiple 12V motors from the drives?
find some way of having your CDRW drive read the platter? Perhaps in a custom-built CDRW drive tray?
hey! I'm trying!! Lol