The irony is that piercings, tattoos and hair color ceased to be rebellious a loooong time ago (and I say this as person with piercings, tattoos and colored hair). It's rebellious when you're 14 and Dad tells you not to, so you do it anyway. When you're an adult, there's nothing rebellious in it. If you do it because you enjoy it, be my guest. Like how it looks? Go ahead. But you're not rebelling, subverting or "challenging" anything.  It also doesn't help that fats don't want to spend money on anything but food, so their modifications are almost always of a poor or inferior quality. Pay for quality, people.