Shawn Thorsson has made these very impressive Halo Chief costumes. He’s made them with a variety of rainbow colours.
It took him an astounding 3 years to construct and you’ve got to admit that they are very magnificent. His last version of the costume was a papercraft one, which was then printed out and then designed with detail, which took a lot of time.
Once that was done, a special mold was made out of it, then a cast was made out of urethane resin. The helmets themselves have LCD lights and fans. Awesome stuff!