Let me adress a few things.
Civ 5 has Icons work in two different ways:
First, stock image. It's the Leader and Unit and Building Icons. Those will never change. The only Civ image that does that is the one that represents the Civ - the one you see when you select the Civ to play it.
Second, alpha image. Literally empyting the space of what you want, and letting the game automatically fill it for you (it already does it). The Civs have two colors - Background (text, the very border of something, so Yellow for Sweden, for example), and Main (the main color, so Blue for Sweden, for example). It's the one that's going to appear in the main game. However, this also happens with Unit Icons! It's why you can have Brazilian Keshiks with the Keshik's Icon in the Unit itself, the Alpha Icon above them and Brazil's colors filling the Alpha Icon.
So:
- Yes, it is possible to give the Con Artist an Unique Alpha Icon - it's an unit.
- Try making that Tree Icon literally empty space. In fact, I think it's better if we use that Tree Icon with a green background for the Civ Icon.
- I think it's possible to give unique new art to the Great Artist, not exactly sure if anyone has done that. Maybe as a joke giving them the same paintings when they're actually falsifications or something. I don't know.
Civ 5 has Icons work in two different ways:
First, stock image. It's the Leader and Unit and Building Icons. Those will never change. The only Civ image that does that is the one that represents the Civ - the one you see when you select the Civ to play it.
Second, alpha image. Literally empyting the space of what you want, and letting the game automatically fill it for you (it already does it). The Civs have two colors - Background (text, the very border of something, so Yellow for Sweden, for example), and Main (the main color, so Blue for Sweden, for example). It's the one that's going to appear in the main game. However, this also happens with Unit Icons! It's why you can have Brazilian Keshiks with the Keshik's Icon in the Unit itself, the Alpha Icon above them and Brazil's colors filling the Alpha Icon.
So:
- Yes, it is possible to give the Con Artist an Unique Alpha Icon - it's an unit.
- Try making that Tree Icon literally empty space. In fact, I think it's better if we use that Tree Icon with a green background for the Civ Icon.
- I think it's possible to give unique new art to the Great Artist, not exactly sure if anyone has done that. Maybe as a joke giving them the same paintings when they're actually falsifications or something. I don't know.