mistri: I agree completely with what you say. I think of my works as being of high quality; they look into the meaning of life and humanity and they are entertaining.
Pluvious, you said, "If you let a theme simply happen then you aren't putting any thought into it beforehand. And its not really a good idea to think too much while you are writing."
What I have to say to that is this: If you think up a theme before hand just for the book you are writing at the time then you probablly haven't thought that much about the theme before hand. I include themes that I have pondered my whole life and in that way I don't have to set them up, they just come naturally out of my writing. As for not thinking while you are writing, what the hell are you talking about? That doesn't sound like such good advise to me. I think I know what you mean, but still, thinking is very important while writing, you just have to be thinking about the right thing, the task at hand, and not let your mind wander into the currently unrelated things.
BTW, for twelve: I completely agree, I also need to have an outline to work with before writing or my stuff comes out like crap. I never meant to imply that I just write as I go along and haven't thought out my work. To me, personally, themes do not have to go into my outline. They inherently go with the plot and action in my book. Dialogue also stays out of my outline except for maybe a few catch phrases that I happen to think of while I'm making the outline that I feel the urge to write down.
It's all just a matter of prewriting taste, and I assume that all of us are reaching toward the same goal -- a good story. It doesn't matter how it is prepared. There are as many ways to prepare a book as there are authors out there (except for those that went to uncreative seminars to learn formula writing, but I don't think that's any of you!) I encourage the differences.