This recaps something I mentioned about dealing with writer's block. For me, the best source of inspiration is the work of my favorite authors: Loren Eisely, A. J. Heschel, J.R.R. Tolkien.... There are others, but these are the ones I go to most when I need inspiration.
These writers have a feel for conveying a scene or an idea, such that I can simply read and drink in their words. They never fail to inspire me.