I had a bunch of spiral-bound notebooks which I had used for various classes, and each of them had about 25 remaining clean sheets out of the original 100. I would not be able to use the remaining sheets for another class easily, and it seemed a shame to let them go to waste, so I just did some surgery.
I snipped the coil locks with dykes, twisted the coils out, and assembled the clean sheets into a new notebook shape, with the back and cover from one of the disassembled notebooks. Then I twisted the coil back in through the holes and used pliers to make new coil locks.
Viola! A stringed instrument! And voila! A new notebook!
I'm now trying to decide if this makes me resourceful, crafty, and smart, or simply a huge lame-o loser who rebuilds notebooks in order to save $3.
You may wonder what happened to the notes from the classes. I've got them in file folders for now, but once I don't need them any more for school, they're going in the recycling bin. I learned that lesson the first time around: the only school notes I ever used after I finished school were my Shakespeare notes, and that was because I hadn't yet bought my trusty summaries of the plays that's ever so much better than my notes. Yet I toted that crap around with me for five years.