EEiiiiiinterestinkk. I will have to do some thinking about this, because my long history of icons has been sort of a Venn diagram of your categories. Quite a lot of overlap in certain areas. (i.e. My Fandom Talks To Rocks is as much representational of me being lecture-y and misanthropic as well as relevant to general science fiction/artificial intelligence/space clothing™/gratuitous use of hexagons.) After having my icons become more and more condensed on LJ, I don't think I have many metric hexdriver type icons anymore.

::runs off to make Venn diagram::