There's a Halo Master Chief Swarovski helmet up on eBay. It's for charity.
The Master Chief helmet is covered with 25,000 Swarovski crystals and weighs about 5kg.
It's the work of Taiwanese cosplayer Hsu Chia-Hao (alias Braid Clarke) and Australian designer Jenny Manik Mercian, the latter of whom has worked with the likes of Victoria's Secret, Beyoncé and Gisele Bündchen. All auction proceeds go to the Make-A-Wish Foundation, a non-profit that arranges experiences to children with life-threatening medical conditions.
Interested? Be warned: there's a $200 (£130) FedEx International shipment cost to have the helmet flown in from Taiwan, plus you'll need some big bucks to win the auction itself.