It's a little late to wonder about it now, but did anyone (official or not) ever design icons for each of the servers? I was thinking about my time with Ultima Online, and shards (servers) were at the center of their mythos. There were icons for each:
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http://www.uoguide.com/ShardsI know that CoH pretended each server to be the only one, but that doesn't mean they couldn't each have had their own icon.
If a set of nice icons does not exist, is anybody up to the challenge? For inspiration, you could start here:
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http://paragonwiki.com/wiki/ServersThat article does not yet include the Beta and Test servers, but it could, and their shiny new icons too.