Impressionism?

So in French class, we watched this super bizarre movie called 8 Femmes (8 Women)... Which I guess some critics have described as being impressionistic... I'm not sure if I agree, but I'm no expert, so maybe it's a possibility. For me it has all the weirdness of impressionism, but without any of the finesse and subtlety that makes me usually love it so much.
Anyway, in French class we did this activity that Mme Sauret claims was used by the impressionists to help them write poetry... I'm not sure how true that is, but it was fun anyway. We each got a piece of paper out and wrote a noun down (this was all in French, of course). We then folded the top of the paper over and passed it to the person next to us. Then we wrote an adjective down, folded it, passed it, and then wrote a verb and an adverb using the same process. My favorite one that was generated was:

La couleur rouge a chanté doucement. (The color red sang sweetly).

Friday night I went to this year's first poetry slam... I love going to slams and I keep trying to write my own poems... but I've just been writing analytically for so long that it's almost like I've forgotten how to be creative and symbolic in my writing. It's not like I can make the audience members sit through 3 minutes and 10 seconds of every single problem I've had in my life, systematically written down in chronological order.
So, I try to come up with metaphors. But my brain can't figure them out...

So, I was thinking maybe what I'll do someday is put a few jars on my desk with different parts of speech in each one... I'll then pick words out of the jars to make sentences like the one above... most of them will be dumb. (Like, the depressed lamp rolled languidly... which is funny I guess, but not that applicable to my life, usually)... but maybe something beautiful will happen...

Or maybe I'll just write a poem with as many stupid sentences as I can.

How do you get over creative writing blocks?