Nipple Jewelry no longer has to be plain hoops or barbells. Now you can style your nipple jewelry to be as unique as you are and to match your outfit too. While most pieces of nipple jewelry are marketed to women there are plenty of asexual designs in there as well. When shopping for body jewelry you'll need to look for certain standards to make sure you're getting a good buy.
Steel & Titanium - These metals reduce the risk of infections and prevents bacterial built up because the surface isn't porous. If you want to choose gold it needs to be for a well healed piercing and you'll need to know you don't have any allergies. Titanium can also be anodized in multiple colors.
The right size - There is no such thing as a “standard” nipple, so it's important to know your anatomy and realize that you may need a larger barbell or that you make have to wear barbells rather than rings for everyday comfort.
You should wait at least 6 weeks or longer (depending on your piercers instructions) after your initial piercing to change to anything fancier. this is because these are more likely to catch or irritate a fresh piercing. Standard nipple piercing sizes are 14g and 16g. Once you're ready to go you can look at some styles like these:
Nipple rings are still pretty standard but when you put unique captive beads in them you can change the whole look. Captive beads are the small ball or shape that pops into the metal ring and completes the circle.
Nipple barbells are usually the best thing for sensitive piercings as they are less likely to catch or move and this can also prevent keloids. That doesn't mean they have to be boring though. Like nipple rings, you can change the balls on the end for more interesting items. You can also get circular barbells which look like rings but don't join up so they have two “balls” on the end that can be changed out for anything.
These are the most elaborate type of nipple piercing jewelry. They are still essentially a barbell only this also has a surrounding ring which circles the nipple and is pinned in by the balls on the outside of the barbell. Remember Janet Jackson's “malfunction” at the Superbowl? This was the sort of jewelry she was wearing. Shields have the largest range of styles as the outer ring can literally be anything.
Hangers are similar to shields in that they are a straight barbell with an additional piece of jewelry attached. Unlike shields, these have a design that hangs by small chains from the barbell. These are the most likely to get caught but are often the most sparkly and unique.
Clickers are a really great compromise between rings and barbells. The insertable part is a straight barbell that clicks into place in a half ring, giving you the appearance of a ring but with the comfort of a barbell. Clickers are almost an elaborate as shield and have a bar that clicks into space with a semi circular design around the nipple.
Once the piercing is healed it's okay to swap out for anything that suits your style.