OT: old CDs - what to do with them

Hello, My name is Kevin and I am a packrat.

There, I admitted it.  I have taken the first step.

This proclivity for saving all kinds of items with potential
usefulness [read:junk] was exacerbated
by my turning (pardon the pun) to woodturning.  All available
horizontal surfaces are now used [read:cluttered] with bits of wood,
parts for tools, batteries from cordless drills, odd bits of
sandpaper, and well, you know.

As part of my job, the one that provides me with money to feed my
turning, I have access to lots of CDs. Rather than toss out the
expired software on them, I have been saving them.  At one time I
thought of building a chair out of them - large chair of nothing but
CDs.  I mentioned this in passing to my wife and am still recovering
from 'The Look'.
Now some may mention that putting one in the microwave will provide
amusing light and sound as well as an olfactory show but I am looking
for something a bit more permanent.