I've done that before.. it's not hard so here at the intructions:
Items needed:
cd-rom
jewel case
dremel
rubber cement (or something of the sort that will glue plastic to metal)
Yea so basically cut your shape out with the dremel, cut out the shape in the jewel case, then glue the cut out peice of plastic inside the cdrom using the cement... then put something heavy on top to make it stick better..
Hope ya liked my guide!