This is my personal favorite icon from the Warhammer 40k Universe - the Adeptus Mechanicus icon!
This was actually the very first 40k prop I started making. I finished sculpting the half skull and got hung up on the mechanical side so I wound up putting it down for over a year. I was finally motivated to pick it up again and finish it off and I'm so happy I did. I love this one
Cast in resin, it measures about 7" across and looks awesome hanging on the wall of my game room