Victoria 2 is a videogame by Paradox in which you control a nation throughout the 19th and early 20th Centuries. An interesting part of the game is the possibility to switch government type. This means you cold go from a kingdom to a republic, or from a fascist state to a communist state, or from a presidential dictatorship to a kingdom again. Flags and country names change according to these political changes.
My mod (a WiP) allows you to recreate the nation of Rome (Roma), if the proper conditions are met. I already have flags for the kingdom / empire (of course), for the republic, and even one for the fascist state, but I was just missing a communist one.