Maybe you have an old cd you don't need anymore? Instead of just throwing them away you can turn your cd's into coasters by painting them in creative ways using paint for glass. After you are done painting stick some small non slip silicon stickers on the back so they stay in place when you use them. You can even decorate an old multiple CD pack in order to store them.
To break CDs, boil a pot of water and then place in a mixing bowl. Place the CD in for about 5 minutes so that it softens. Then you can use scissors to cut any shape you like or simply break it up with your hands. And yes, good ventilation is necessary for this one (though we didn't actually smell any fumes).
I am sure there are a few unwanted CDs lying in some corner at every home. One day they are bound to see the trash bin and get added to the e-waste generated by this world. But hang on a minute, there are almost infinite ways in which you can reuse these old CDs to create something really useful. So