Tattoos are a uniquely human thing, as nobody else has thin naked skin like we do, and we’re often much more into extreme piercings and body mods than everyone else. Nail polish art and acrylics (fake nails) are also rather uncommon among the other aliens, mostly because we don’t use our weird flat nails for traction and locomotion the same way ferrets, avians, and especially the centaurs do. Skimmer avian brights have the closest native thing to our nail art culture, the most common form of which is dipping the hand claws or teeth into lacquer and wiping off the polish. Since humans joined the galactic circle and our culture spread, there have been many subcultures attempting to imitate our weird fashions and many human subcultures attempting to imitate alien fashion. Speaking of which:

Centaurs will sometimes shave patterns into their short body “fur,” and will often dye these patterns. Centaur’s “fur” is structurally more similar to feathers and only molts a couple times a year, so these patterns last much longer than they would on a human head. Body painting in general is a big dealio for centaurs, and many paints have a clay component to help with body cooling and standing out on fur. Piercings are also fairly common, especially on the trunk, lips, breathing outtakes, and… genitals…. Fur and antler dyeing is common as well, though most traditional stains are derived from plants and animals and don’t come in wild colors. Human and ferret artificial dyes can be used instead, but it’s a mixed bag how centaur biology will react to them (accidental poisonings and allergic reactions are common in situation like this). Antler carving is another common tradition, usually accompanied by staining, and the shed antlers of dead loved ones are often kept and displayed together at clan altars.