Take a break from your WIP. Go for a walk, or just get out for a while to clear your head. I find when I stop thinking about it for a while, something will come to mind and leave you wondering how you didn't think of it in the first place.
Another option that has helped me with a serious story blockage was to write something else. I have a number of short stories planned, and it's good to have something fresh to think about.
Based on the reviews of my debut novel, they mention it's like reading Terry Pratchett, or in one of them, Douglas Adams. I think this is mainly because the novel involves a coven of witches in a humorous tale. Other than that, I don't think my writing style is in anyway similar.
I certainly would not presume to put myself in the same class as those two masters of the art.
