I've been taking some time to try to expand my vocabulary of the shapes I can make using round gemstone beads. These are 4 mm, mostly red aventurine, for no particular reason except that I had a lot of it. I was interested in the idea of graduated sizes, so I came up with 4 sizes of disks, 3 of sort of teardrop shapes and a couple of kind of lozenge-ish shapes. The curvy pieces at the top left had to do with trying to make shapes that were not just convex (I think that's right, I sometimes get concave and convex mixed up, but anyway shapes that curved inward as well as outward). I made a necklace using the graduated rounds. Unfortunately, I hadn't figured out the 4th, largest, disk yet, so it just has 3 sizes. That 4th size, by the way, is pretty big-- 2 1/2" in diameter (6.2ish cm).