1 hour ago, vichn said:Which could be what, specifically?
Nipple rings (or rings in general) or filed teeth for Slaanesh cultists. Implanted horns for Khornates. Adherents of Nurgle could perhaps use syringes to implant their skin with pustules, or inject themselves with various toxins in general. For followers of Tzeentch, perhaps talon-like ceramite fingernails or blue "reptile eye" contact lenses.
In general, you just need to look at either the daemons or the practices of the cults, and then extrapolate what and how someone could emulate / pay homage to them.
Of course, most things like these are fairly obvious, and so may be encountered openly only in places where the Emperor's light does not reach (underhive, non-Imperial worlds). However, I'm sure some could be passed off as merely a local quirk, to be recognised only by fellow cultists. Elsewhere, such displays of affiliation would likely be far more muted, or perhaps concealed under clothing.
Edited by Lynata