It'd be a lot easier to see/comment on all of your sigs if you posted them in one topic. I like this sig, but I'm not really liking the white/brown contrast in it. You do a great job of making your sigs a little grungy while keeping them interesting to look at for people who aren't partial to grunge sigs (though I personally love grunge).
It seems like after you're making these sigs, you go downhill with the text.

Use text that is easy to read and more interesting than..is that Arial font? There's no problem with using plain fonts, but when it doesn't stand out at all it puts a negative point against a decent-looking sig.