I know they'd be misused by our current judicial system and end up being bad, but: shame based punishments. If white collar criminals getting a slap on the wrist also included being put in the stocks for a few days so everyone can tell them how awful they are I think that'd be an improvement
Put Musk in the stocks and use his money to fund crates of rotten veggies to throw at him. He can come out when all of his money has been spent and all of the veggies have been thrown at him
These do sometimes still happen, at least in Amerikkka. It normally takes the form of a person standing outside the courthouse holding I sign saying "I littered" or whatever.
No but my favorite bit joke punishment for a lot of ghouls is the old Korean punishment of rolling them up in a dirty straw mat and beating them with sticks until the mat's clean.
"The Melon Helm of Wisdom" - This was basically a punishment for giving bad advice. The guilty party would have a hollowed-out melon placed on their head, with holes cut for their eyes and mouth. They had to walk around the village giving advice to people while pretending to be "The Wise Melon Sage" and be a target of public ridicule. Villagers would often pelt the Melon Sage with smaller melons to show their disapproval.
EDIT: Oh I just saw the Musk comment and thought this was just a general question. For Musk specifically, look up "scaphism".
That was because of their blood taboo where the blood of nobles (or really anybody) should never be shed or seen, so they elected to kill nobles in ways that avoided bloodshed.