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Interesting ideas for melting and using old CDs for jewellery. Boil until soft enough to cut, then heat in oven so that it bubbles, to get bubbly texture. I may or may not like the result.

Recycle CDs into card-holders for playing cards; useful for little or unsteady hands (or card games with LOTS of cards!) I'm a bit skeptical that it would work, but it's worth trying.

This tutorial just uses stones and felt.

I've also seen a suggestion that one could stiffen up the trivet by sandwiching a CD in between the two pieces of felt. Though that would make something closer to the size of a coaster than a trivet.

One could also use those flat glass pebbles instead of stones.