It would be very fun if custom application messages could be set like how artwork can be installed in a room in a custom way. It would allow for some additional artistry in how make-up is applied more like tattoos, and would allow for more personal style rather than rote default messages.
Anything that can allow more expression, for the good or for the gaudy, sounds fantastic. Crazy mixer face paint would be so fun! It could also make more business for PCs who make money doing makeup for other players.
Additional alternative idea: Corporate-priced holographic SkinWriter that does as well.
Have current makeup function like dynafiber with skilled artistry/disguise people able to assign custom %bodylocation @messages to certain makeup kits. For bonus points, make it more difficult to assign sequential %bodylocation @messages to one makeup object to reward skilled PC's.
The concept IC would be artisans/disguise people able to provide a temporary conceptual makeup concept to another PC but leave them coming back for more as supplies run-out. In addition, Makeup styles would be easily copied and remaining contemporary would be a struggle.
...but mostly I just want to do this:
