Here's one I wrote after what we in the romance novel world call "The Black Moment." It's that part in the story where you're not sure the hero and heroine are going to get that happily ever after.
After I penned this poem, the juices started flowing again and I wrote the ending to this character's story. This method may not work for everyone, but it's always been successful for me. It unlocks my mind and gets me back in tune with what I'm trying to convey to my readers. It brings the emotions to the surface.
The next time you are stuck, give character poetry a whirl. You just may find the words you're looking for.