I had the idea of a crowns aura or a money aura if you will. It would be similar to the sprinkle aura, but instead of sprinkles you would have crowns spilling on the floor. It would also leave a trail of crowns behind you when you walk. For extra bling it could also have the twinkle aura effect. I wouldnt make the crowns too big like they are in clockworks, around the size or slightly larger than sprinkles from the sprinkle aura would look best I think, perhaps make them gold instead of copper. Since this would be the aura to show off that you are mad rich, it should probably be on a flash sale. (So it is more of a money item rather than a collector's item that you paid a lot of money for).
A hardcore version could be that the crowns that drop from you, actually spill out of your inventory. The aura itself could be cheaper then, but require an upkeep when equipped. I think 3-5 crowns would spill every 5 seconds, so that would total to something like 3k per hour with the aura equipped. Not that much for the billionaires of SK, but pretty badass nevertheless. When walking around, more crowns would spill though, so only the real MVPs will be doing random missions or running laps around the haven fountain with this hardcore version of the Money aura.
Oh lordy, could you imagine the lag from 50+ beggars all huddling around someone with this aura, biting at eachother and fighting over every last cent that falls out of their pockets.