There are corporations in the game, but non of them are real ones that really existed, so how about having historical corporations? this are some examples:
The East India company: needs sugar, Silk or Ivory. Grants +2 experience to units and 5% gold. needs Astronomy and a great Merchant.
The Henseatic League: needs Wheat. adds 15% culture and +1 movement bonus to ships. needs Economics and a great merchant.
The Knight Templars: requires Iron, Incense, Horse and a state religion. grants +25% Espionage and +10% culture. needs divine right and a great prophet.
Holywood: requires Gems, Copper and Electric Power. each corporation spreads you're culture +10 in foreign cities (to simulate the spreading of American culture). needs mass media and a great artist.
It still need 3 more corporations.
So what do you think?

Hudson's Bay Company (needs fur, cotton and deer), founded by a great merchant. Gives 2+ happiness and 10% gold to each city that has it.

Harvard College (which is still a corporation), founded by a great scientist. Needs no resources but needs library, university and observatory and a minimum of 2 religions in that city, and free religion/emancipation/free speech. 5% science and 5% espionage per city.

Ford Motor Company, founded by great engineer. Needs iron, aluminum and oil and having built ironworks. Gives city 15% more hammers, 5% more gold but 2 unhealthiness.

In the past I sugested other corporations too, but no one cared, so I think no one will care now. Maybe I will make some later on, but I was more thinking of stuff like
McDonalds (have a Yum Burger Icon that looks nice) uses corn weat, cow, fish, +.05 food

Some sort of fashion enterprise, uses silk, cotton,gold, gems, +1 gold, +1 culture

Silk trade route: uses silk, +1 gold +1 culture, executive is like a small version of great merchant.

A Hudson bay corporation: fur, deer,...

Steelmills coroporation: iron coal copper, alumenium

I've never actually used the corporations yet, so I dunno if more is appropriate or not.

That said, I'm all for renaming the existing corps. I can kind of see why Firaxis didn't want to but MacDonalds in their game, but I don't think "Sid's Sushi Co." is appropriate for a historically-inspired mod.

Japan has sushi fast food corporations like McDonalds, and fast food corp. are very big world wide spread corporations, so that why I think a fast food corporations need to be in, BtS (normal) has a dds file for McDonalds in BTW.

I think some large american ones should be in but they shouldn't ALL be american. The East India Trading Company etc... should be included. :)

We're going to be trying to do this with RFC Europe, if we ever manage to get off the ground. Y'all are welcome to help.