o i thought you meant you were going to start making mods
The last game I was playing had the following mods going (starred ones I always use):
*InfoAddict
*Quiet Diplomacy
*City Limits
*Faster Aircraft Animations
Buildings Upgrade System
Starting Scout
Mint Include Copper
Promotions - Expansion Pack
No AI Free Pottery
*Smart Quick Turns
Wonder Race
Culturally Linked Start Locations
*Less Ice on Maps
*Extra Game Options
Starting Worker
*Cities 4 Hexes Away
Gold Rush
Civ Names By Policies
Battleships to Missile Cruisers
Diplomacy Values
Warmonger Debuff
*Gibraltar and Reef Optimization, Krakatoa Fix
Gradually Slower Research
Historical Religions Complete
Modded Austria- Cultural (this changes Austria to be culturally focused, so I was playing with them, from JFD I think)
Scouts Ignore Borders
Seperate Great People Counters
Trading Posts Grow Into Towns
Tinker around through these:
Smart AI
Aggressive/Expansive AI
Artificial Unintelligence Lite
The promotions expansion and PolicyPlus+ I tend to use a lot as they tend to have all the promotions/policies be worthwhile rather than trudging through four shitty ones to get the one good one or whatever.
I've messed with the Communitas thing but it breaks the game if you use it in conjunction with the wrong mods. I often play with the Corporation mod, though like Civ IV it really just functions as a later game religion but people don't hate you when it expands into their city. (THE DUALITIES) Sometimes I add a bunch of random new civs, though some of them are ugly as sin or have horrific design to their traits/units/etc. JFD's are decent but they tend to have a 20th century focus. Otherwise I mostly will just pick new mods to play with that sound like they might add something and if I can tell what that is.
A lot of them make grander claims than they actually enact. Or they completely destroy the functionality of something.
One I like and I'm surprised I didn't have it in this game is Caravansary's add another trade route.

Valve updated the workshop so you can now do "Most Popular (one year)" or "(six months)" which basically gives you a best of list since highest rated would include stuff that only had like three ratings. You used to only be able to do today and one week which wasn't that helpful.