I just go w/ the flow...depending on the render....grunge tends to lend its hand in war/battle sigs. Final fantasy goes well w/ an abstract style.
I just freestyle. If it ends up Grunge, fine. If it ends up Abstract, fine. If It ends up something very random, then fine
Vector, Abstract, Grunge, Mixes... Anything I can put together to look good. ^_^ If it looks good to me, who cares?!
I do whatever im inspored to do at the moment... Sometimes its grunge, sometimes abstract, sometimes vector.