Ken found one more good use for unwanted discs -

Oh what to do with CD’s, some blinking lights and a hot glue gun.
Why make a holiday tree (the politically correct term).
After sending out an E-mail to all of my fellows instructors for their dead cd’s. I received over 100 in interoffice mail. I picked out 79 of the finest dead cd’s and equipped with my trusty hot glue gun and assisted by my students who didn’t want to do any real work, we laid the cd’s on a flat surface and glued them up. Note: Hot glue doesn’t really stick to well to the cd. ( Oh well you live and learn)

Nice – guessing it looks even cooler in a dark environment. – Holiday Tree Hang in the Class Window