Used books. My greatest weakness. Remember that in case I ever become a super villain or a zombie and you have to defeat me to save the world. As I was saying...used books. There is no greater pleasure then wandering through aisles of musty books looking for that one treasure. I hardly ever buy new books, instead relying on chance to guide me towards my next read. Old books are also key material in my projects. I use them for stationery, blank books, and drawings. Sometimes, one book can even become the foundation for a whole body of work.
Recently, I started a new series of drawings using the pages from an 1897 geology textbook. I haven't done a series of drawings for quite some time. The act of drawing doesn't come easily to me, I liken it to pulling teeth. There's no structure to hide behind, no rules really. You just have to do what comes to you. That can be pretty scary.