However, I enjoy all the storytelling games from White Wolf. Mage for Matrix, Werewolf to free the primal urge, and Changeling to release the child in me. But the one that I really would like to play more is Wraith. If I see a picture based on a great idea I store it the back of my head. There it's mixed together with some old ideas, and within a couple of hours its reshaped into a fresh new idea that may be good enough to be used, or bad enough to be forgotten.
Concept art is very useful.
I also travel a lot. Whenever I travel I take a load of pictures. I take pictures of everything. I try to collect pictures of things that are specific to each area. My red thread is that I always play a character with a dark background.