There are two different ways: one is difficult the other more difficult.
1.If you have Alien CrossFire
In the main directory there is a file named Facedit:
opening it you can modify in a simple manner all Faction's aspect.
2.If you don't have AXFire
You can modify an existent faction's file e.g.:PEACE.TXT
Both method require a lot of patience and a reading to ALPHA.TXT or ALPHAX.TXT
To create your own graphic set you can use a lot of tools that you can find at
civilization.gamestats.com/smac
[This message has been edited by Vultur (edited September 09, 2000).]