RamTheDragon, aka Sofia, dressed as Krystal at ConComics 2012, about a month ago. Like Kat the Leopardess and Bridgette Rockette before her, RamTheDragon's costume is bodypaint-based. She has a facial prosthetic created by Northfur FX and a staff just like Krystal's. She really enjoyed herself and has been wanting to cosplay as Krystal for a long time. More photos and info coming soon.
Thanks to Kat The Leopardess for the info.