This isn't a very original design, but I created it to learn how to better use the CAD program I'm using. It turned out really well, so I printed it! But I used some Turbo PLA with a high layer height. I think it gave it a cool effect, but I had originally planned to print it in a marble PLA with more detail.

The angle on the spikes should be fine to print without any supports. At least it handled it well on my MK3S.