I once read from an interview of some Pixar-studio guys that whenever they have big problems in their animation projects, they gather to this auditorium and watch animations by Hayao Miyazaki... and they always find the answers they need.
I have quite similar thing myself. Whenever I'm stuck with an illustration, I sit down (usually on the living room floor) and read (or just leaf through) Miyazaki's amazing comic "Nausicaä of the Valley of Wind". Many times I find the answers I need... and sometimes it just makes me to forget the problem... but always it makes me feel happy.
If you don't believe me, try it.