@Gen.Rommel and Keroro
I have made shadows on some of the other borders I have made, which made it look like there was something under the water when the borders went over water.
Now I would have to consider piles of rocks and such under the borders, now that they could be made to look half decent.
Funny, one of the first things that popped into my head was someone trying to make laser beam borders for a sci-fi mod. Now we could make them with a nice post with a laser cannon or ray gun mounted on the pole. The laser beam would be the civ colours.
Here is a preview with water, I loaded it into my current game, I think I will go back to my chainlink fence for now.