I use Pinterest boards to store art I like – the Writing Inspirations board has pics that either remind me of certain things, or that are vaguely like items or people I want to use in the books. Now, it could be anything in that pic. It could be the faceplate of a helmet, or the knee joints of an alien species. I have a Casting board where I stick pics that vaguely remind me of characters, and is there because my ability to draw is a wtetched thing indeed. I can picture most of my cast in my head. Finding pics to go along with that is usually pretty difficult.