Warhammer 40k Purity Seals
I made a set of these as prizes for a local tournament. I started by making the seal out of red Sculpey. To get the ring of "text" I pressed the end of a PVC fitting into the clay then rotated it and pressed it again. The rest of the details came from model parts pressed into the clay.
I baked the seals in a toaster oven. Once cool I painted them with citadel paints. For the oath papers I printed passages from the Imperial Infantryman's Uplifting Primer onto thick cardstock. The paper was glued to the back of the seals then the edges were selectively torn and burnt. To finished a pinback was glued to the seals.