O, ok, sorry
I wasn't saying depression is wonderful. I went through a pretty deep depression for, well, most of my teenage years (I'm almost 20, so this isn't that long ago). I wouldn't want to go back to that state of mind —I'm one of those annoying "I love life" people now. Only slightly less annoying than those "I hate life" people— but it definitely didn't hurt my creativity. I would spend days without sleep, writing and painting.
A lot of it was a crap-O-licious display of crap; a crap extravaganz-O-rama, if you will: mad, depressing, ramblings. And considering I had just moved to Canada and my English wasn't very good: horrid grammar errors. But some of it was interesting. And I often steal from myself and polish things that I wrote back then. I still write a lot, and better, I think; just not as compulsively as I did back then.
Here's one of my old depressing poems. I was 15 or 16 when I wrote it:
way too much for my taste now, but it still has some amusing lines I'll probably steal for something better.
I think depression is very common among artists, not because the depression itself is what causes the creativity: Hours of deep, brooding introspection are inherent in a depression. This is more likely to be the cause of inspiration than the depressions itself.