Halo is still one of my all time favourite games, going all the way back to the original X-Box (and yes, I still have one). It's not just a good game, I also enjoy it because it's a really good story behind it, and I really do recommend reading the follow up books and comics to flesh the story out a bit.
One of people's favourite parts of the story, and which eventually was made into a standalone game, was the concept of the Orbital Drop Shock Trooper or ODST. ODSTs are an elite force of Marines who are trained to drop from spacecraft in orbit around a planet using specially-designed orbital drop pods, and who are trained to operate behind enemy lines to secure seemingly impossible objectives. I decided to pay tribute to the ODSTs of the Halo universe and make their emblem into a coaster.
You don't just have to use it as a coaster of course. It could also be used as home decor, pimping out your gamer gear or even as a cosplay costume component. It's entirely up to you! It has the usual holes for 3mm x 5mm neodymium magnets so it can be permanently mounted.
If you'd rather I did the work for you, you can buy one printed and assembled in my Etsy store - www.etsy.com/uk/shop/enterprisexddesign