This is the beauty of app settings...
So your color etc should be assigned using App settings...
Suppose you have a setting called "CurrentColor"
var settings = YourAppNameSpace.Default;
string currentcolor = settings[CurrentColor];
somcontrol.BackColor = Color.FromName(currentcolor);
Also save settings as :
var settings = YourAppNameSpace.Default;
string currentcolor = "Blue";
settings["CurrentColor"] = currentcolor;
settings.Save();