X-rays are usually the colorless bringer of bad news. Hey look there's your broken hip. See that crack? That's where it hurt. But if you look closer, the detail and image quality of x-rays can be pretty damn incredible. A radiation physicist Arie van't Riet noticed that and has now used the machine to create art. His pieces reveal the hidden beauty underneath the skin. They're fantastic.
MyModernMet has a collection of van't Riet's work and you can watch Van't Riet talk about his work at TEDx. He started off by x-raying thin objects and then colorizing portions of the x-rays by inverting the silver bromide of x-ray film into colours with Photoshop. The results combine to show something you're used to seeing along with something your eyes can't see. It's a wonderful effect.