At the end of each championship mode, you are awarded a secret 
name for the country you complete it with. You can then use them 
in Trial mode to change the color of the athlete. Put the city 
name in as a case sensitive name in trial mode. 

Athens Grey 
Montreal Gold 
Atlanta Orange 
Seoul Purple 
Munich Light Blue 
L.A Blue 
Tokyo Red 
Mexico Green 
Moscow White 
Roma Brown 
Sydney Silver 
Helsinki Bronze