I dabble here and there mostly theme design but have enjoyed a sig or two in my days here are some:
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and here is links to other things I have done just look around the gallery its new sites and not even half done but at least its and attempt
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what program you doing your graphics in?
cool bg in the first one

CS5 photoshop, Gimp and Maya

nice
what do you prefer? usually the gfx guys have one favourite

Personally I like Photoshop but each have their own uses. Gimp is easier to manage however and it is the best price of all ...free...lol

Yaaaaaaaaaay Gimp!

I really like the effect of on your second sig and site banner, with the Knight armor overlaying the modern soldier. It may be something simple I'm complimenting (I'm not at all savvy about this sort of thing), but I really do like how it looks.

Its actually an eight layer 4 of the knight varried in opacity and 4 of the BF3 warrior the same.