It is thought that the four suits came from French decks of cards. Each suit in the French deck of card represents one of the four classes. Clubs represent the peasants, diamonds represent the merchants, hearts represent the clergy, and spades represent the nobility.
If the suits were to be redone today to represent four classes of people in America, I think they might be a box, a clock, a gavel, and a key.
The box represents lower class people who are down on their luck and seem to be stuck in an unfortunate situation or who are too lazy to better themselves. Unfortunately, there are people who do nothing with their lives. We'll probably see them on a crime TV show someday.
The clock represents the working class who work a minimum of 40 hours per week and take the least amount of vacation of any other Western country. Everyone always seems to be in a hurry and have so much to do, so time is ultra important.
A gavel represents the crazy class of people who will sue anyone for anything just to get rewarded with money. Guess what parents, McDonald's didn't force you to buy your overweight child that Mighty Kids Meal.
The key represents upper class celebrities because they are pretty much given everything they want and always seem to find a way out of troublesome situations. You knowingly drink underage, drive drunk, take drugs, and commit other crimes? That's OK, you're famous, so don't worry about it.
What about the gun? There are a whole class of people whose livelihoods consist mainly of criminal activities...though I don't suppose you really have to change any of the symbols, without a gun, these thugs would just as happily use a club or a spade to pierce your heart then steal your diamonds.