The 501st Legion TK Project is an ongoing project that invites artists to take a life-sized stormtrooper helmet and modify it in creative ways. deviantART user Melita Curphy turned her helmet into a demon:

The horns/teeth, etc are hand sculpted from epoxy clay. The helmet was painted with acrylic with several layers of wet/dry applications...no airbrushing. The forehead eye has been painted with flourescent orange and will glow in certain light. The mohawk is made from high quality National Fiber Technology hair that i hand dyed.

Link | 501st Legion TK Project | Previously: Avatar Stormtrooper Helmet