The Ruiz Brothers and Phillip Burgess have made a set of what they call "fire horns," and they were 3D printed in Ninjaflex material to make a flexible, wearable set of LED lit horns. They're hollow, so the 3D printed horns allow for the easy placement of a strip or ring of LED lights within. The tutorial and BOM list includes complete instructions on how to create any of 3 different types of horns. You can read the story here: http://3dprint.com/54752/3d-printed-led-lit-cosplay-fire-horns


Below is a photo of the 3D printed horns: