Personally, I think single-hole earrings are okay. My husband doesn’t care for them. I used to wear earrings but I haven’t for the past few years.

Single hole piercing in the lobe of the ear--for girls.  This is the absolute limit. 

Anyone who puts a nose ring through their septum should be required by law to wear a cow bell and should be ineligible to receive respect.

I can't stand any kind of nose piercing. It's trashy in my opinion.

None are OK.

In the Old Testament piercings, cuttings, tattoos were forbidden.

And I know that formerly there were Kosher laws that were neutral in themselves, but were a test of obedience. I completely understand that Christ set us free from the Old Law, which couldn't give grace. And moreover, Christ elevated us to a higher standard and law at the same time.

But the Old Law also contained the Natural Law (10 commandments), which obviously persists. Along with prohibitions on incest.

BUT -- do you really think Our Lord "freed us from the Old Law" so we Christians can multilate our bodies like heathens like the worst of them? Good thing Christ set us free, right? Now we can extend our necks like giraffes, our lips like ducks (like some pagan Africans do), put large holes/discs in our ears like heathens, put rings in our flesh all over the body, and cover our flesh with tattoos like pagan Aztecs? Seriously?

I'm going to argue from common sense on this one. Seems to me that this is one of those things like Adultery, where if you even THINK about a woman now you're guilty of Adultery. Likewise, we are temples of the Holy Ghost now -- it would seem to be a WORSE crime for a modern Christian (i.e, Catholic) than if a Hebrew had done the same thing(s) to his body.

St. Therese had her ears pierced. 

Slaves and cattle had a ring through their nose. It's the worst kind of trash fashion. Nothing says "white trash" like a nose ring. It's up there with a Tramp Stamp.

Matthew

I more view it as "bimbo," "liberal," or "mentally ill"

I’m okay with pierced ears and smallish, tasteful earrings.  Some Indian women look nice with a tiny stud on the side of the nose.  It’s traditional in the culture.  Guys shouldn’t have pierced anything.  Any piercing that harms the health is out.  Tongue rods, barbells, pierced lips, septums, eyebrows, cheeks, or privates including belly buttons screams, “I’m cheap and have no class,” to me.  
Tattoos on women?  No thanks.  
If a guy has been in the military and has a tattoo that can be covered up, I understand.  It would be better to not get it, but it wouldn’t disgust me if the tattoo itself was of something masculine and decent.  
Other body mods like scarification, branding, foot binding, lip plates, etc. cannot be undone, so these should not be done.  This isn’t to say one can’t become Catholic after the fact, but Catholics should avoid permanent body modifications.  
I’ve seen women with Rosaries tattooed on their calves or arms.  Sorry, to me that looks cheap.  Why not wear a Rosary or carry one?  Somehow, I don’t think anyone actually prays on a Rosary tattoo.
People covered in tattoos, piercings, and with other bizarre modifications looks demonic, imo.
If anyone wants to make lots of money in about ten years, just invent a method of effectively and relatively painlessly removing tattoos.  Patent it and sell it to aging people with crepe skin!  
Keep in mind, also, that tattoos and some Jєωelry is expensive.  Better to give alms than to get a religious tattoo!   

St. Therese had her ears pierced.

Or they could be the kind of earrings that clip to ear.