I have become fascinated with dice made from alternative materials, and am slowly building a collection.
Here is my latest addition, a couple of chonk d20s made of jesmonite from Magpies and Trinkets via their Kickstarter campaign. My photo doesn't really do it justice, sorry!
Here's a podcast where they ran a one shot where they were evil characters who were all sentenced to death, but if they survived the dungeon, they would be spared. Plot Points: Evil PCs Play Basic D&D