I would love to see piercings in the game. For example, a belly button piercing would be fun and I think relatively easy to implement; ear, nose and nipple piercings would be great too.
I also think that rings would be easy to implement as fingers and toes don't change in size. Engagement rings would be great as an indicator that a couple are engaged, then a wedding ring would be great when they are actually married.
Would love to see these in the game!W