Something else I've been working on lately (well, lately before I started a heap of other things and now I'm starting to return to it,) is a weapon mash-up/multiplication table/Punnett square.
It's fairly self-explanatory... people have been combining weapons for years, but I think it would look interesting to see the combinations as a spectrum.
So far, Knife and Pistol are done; the chart will be as tall as it is wide when it's done.