Credit to @Simhera for the general idea, I just expanded on it a little.
Alright, so. Whenever you think of a rich guy, you immediately think of a pool filled with money, right? Well how about the option to transform your pool into a bunch of coins. It would have to be fairly expensive. So maybe like $100,000 or more. Now, when you would hop into the pool, a splash of coins would go around you. And when you’re swimming in the coins, you would hear the metal clangs of coins, and when you go underwater (or undercoins) all you would see are 2D coins moving around on your screen.