Sigs don't really need to be organized. As long as they're all in the same place then it's good. I could really care less if a sig is basketball themed as opposed to hockey. I'm not only going to C&C the hockey ones if you know what I mean.
I know I haven't been here long and my opinion probably is't valued much but I think this place would be better if there weren't 10 sub-forums in the showcase forum. My proposal is to make the showcase forum in to one list without any sub-forums (of course other than the small/large art, etc.)...