Ok, cool! I also have to look things up as sometimes I'll see a Union to Confederate flag and have no idea what it was.
You looked at Wikipedia already -
https://en.wikipedia.org/wiki/Flags_of_ ... of_Americaand
https://commons.wikimedia.org/wiki/Cate ... of_AmericaI'm looking over the icons for HPS/JTS Atlanta right now.

There's the Hardee Flag, like the one seen in Icon #12. Most famous as the flag of Cleburne's units.

Icon #56 has some during the war and post war meaning and a larger colonial legacy for Alabama -
https://en.wikipedia.org/wiki/Flag_of_Alabama
The Arkansas one, as seen in Icon #104 is not historic from the war per say, but has some meaning added post-war:
https://en.wikipedia.org/wiki/Flag_of_Arkansas
Icon #132 is the Cumming's Brigade flag, related to Alfred Cumming -
https://en.wikipedia.org/wiki/Alfred_Cumming_(general)

Icon #262 is a flag carried by several Missouri regiments and has sort of become the Missouri Battle Flag. Sometimes mentioned as Price's Flag (for Sterling Price) who also had a role in the Missouri State Guard Flag. Obviously featured a little more in Campaign Ozark.
https://mostateparks.com/page/55054/confederate-flagshttp://cdm16795.contentdm.oclc.org/cdm/ ... ion/cwflagA start at least and I'll post more when I can. Other folks should too if they would like!