What else can you do with old CDs and DVDs?
There are some CDs which I can't get the printing or labels off, so they can't be used for making coasters . But I still refuse to send them to the landfill and I have used them to support plant cuttings over water like these herb cultivations here: I often make cuttings from my existing herb plants such as basil and mint to prolong and increase harvesting. I will place the cuttings in old jars (especially those which labels can never be taken off) filled with water till they root and can be put into soil. However some cuttings can be rather short and the leaves may fall below water surface and they will start to rot. So I put each cutting through the hole of the old CD/DVD, then place over the jar. This way the leaves can stay dry whilst the cuttings stay safe in the water. I have done this so many times, my very first basil plant is still alive since 2008.